./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/list-properties/list-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 20ed64ec Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/list-properties/list-2.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 857285933727e0d6539ccc24abeb7a5fe95b45c6 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-20ed64e [2021-08-26 02:04:46,349 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-26 02:04:46,351 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-26 02:04:46,394 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-26 02:04:46,395 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-26 02:04:46,398 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-26 02:04:46,399 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-26 02:04:46,404 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-26 02:04:46,406 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-26 02:04:46,410 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-26 02:04:46,411 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-26 02:04:46,415 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-26 02:04:46,415 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-26 02:04:46,417 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-26 02:04:46,418 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-26 02:04:46,418 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-26 02:04:46,419 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-26 02:04:46,419 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-26 02:04:46,420 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-26 02:04:46,421 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-26 02:04:46,422 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-26 02:04:46,427 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-26 02:04:46,429 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-26 02:04:46,430 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-26 02:04:46,436 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-26 02:04:46,437 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-26 02:04:46,437 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-26 02:04:46,438 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-26 02:04:46,438 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-26 02:04:46,439 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-26 02:04:46,439 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-26 02:04:46,439 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-26 02:04:46,441 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-26 02:04:46,441 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-26 02:04:46,442 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-26 02:04:46,442 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-26 02:04:46,443 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-26 02:04:46,443 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-26 02:04:46,443 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-26 02:04:46,444 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-26 02:04:46,445 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-26 02:04:46,446 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-08-26 02:04:46,476 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-26 02:04:46,476 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-26 02:04:46,477 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-26 02:04:46,477 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-26 02:04:46,478 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-26 02:04:46,478 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-26 02:04:46,479 INFO L138 SettingsManager]: * Use SBE=true [2021-08-26 02:04:46,479 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-26 02:04:46,479 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-26 02:04:46,479 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-26 02:04:46,480 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-26 02:04:46,480 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-26 02:04:46,480 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-26 02:04:46,480 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-26 02:04:46,480 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-26 02:04:46,480 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-26 02:04:46,480 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-26 02:04:46,480 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-26 02:04:46,480 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-26 02:04:46,480 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-26 02:04:46,481 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-26 02:04:46,481 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-26 02:04:46,481 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 02:04:46,481 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-26 02:04:46,481 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-26 02:04:46,481 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-26 02:04:46,481 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-26 02:04:46,481 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-26 02:04:46,481 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-26 02:04:46,481 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-26 02:04:46,481 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 857285933727e0d6539ccc24abeb7a5fe95b45c6 [2021-08-26 02:04:46,728 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-26 02:04:46,743 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-26 02:04:46,745 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-26 02:04:46,746 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-26 02:04:46,747 INFO L275 PluginConnector]: CDTParser initialized [2021-08-26 02:04:46,748 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-properties/list-2.i [2021-08-26 02:04:46,802 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9d554d67a/e0fe88d66ebe45a7811f30adc62024aa/FLAGde560b231 [2021-08-26 02:04:47,236 INFO L306 CDTParser]: Found 1 translation units. [2021-08-26 02:04:47,237 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-properties/list-2.i [2021-08-26 02:04:47,249 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9d554d67a/e0fe88d66ebe45a7811f30adc62024aa/FLAGde560b231 [2021-08-26 02:04:47,588 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9d554d67a/e0fe88d66ebe45a7811f30adc62024aa [2021-08-26 02:04:47,592 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-26 02:04:47,593 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-08-26 02:04:47,594 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-26 02:04:47,594 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-26 02:04:47,597 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-26 02:04:47,597 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 02:04:47" (1/1) ... [2021-08-26 02:04:47,598 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7bc9d985 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:04:47, skipping insertion in model container [2021-08-26 02:04:47,598 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 02:04:47" (1/1) ... [2021-08-26 02:04:47,602 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-26 02:04:47,639 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-26 02:04:47,890 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-properties/list-2.i[23408,23421] [2021-08-26 02:04:47,893 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 02:04:47,899 INFO L203 MainTranslator]: Completed pre-run [2021-08-26 02:04:47,933 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-properties/list-2.i[23408,23421] [2021-08-26 02:04:47,934 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 02:04:47,959 INFO L208 MainTranslator]: Completed translation [2021-08-26 02:04:47,960 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:04:47 WrapperNode [2021-08-26 02:04:47,961 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-26 02:04:47,962 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-26 02:04:47,962 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-26 02:04:47,962 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-26 02:04:47,967 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:04:47" (1/1) ... [2021-08-26 02:04:47,979 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:04:47" (1/1) ... [2021-08-26 02:04:48,001 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-26 02:04:48,001 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-26 02:04:48,001 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-26 02:04:48,001 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-26 02:04:48,006 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:04:47" (1/1) ... [2021-08-26 02:04:48,006 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:04:47" (1/1) ... [2021-08-26 02:04:48,021 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:04:47" (1/1) ... [2021-08-26 02:04:48,021 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:04:47" (1/1) ... [2021-08-26 02:04:48,025 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:04:47" (1/1) ... [2021-08-26 02:04:48,027 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:04:47" (1/1) ... [2021-08-26 02:04:48,028 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:04:47" (1/1) ... [2021-08-26 02:04:48,029 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-26 02:04:48,030 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-26 02:04:48,030 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-26 02:04:48,030 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-26 02:04:48,030 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:04:47" (1/1) ... [2021-08-26 02:04:48,044 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 02:04:48,049 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 02:04:48,058 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-08-26 02:04:48,076 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-08-26 02:04:48,094 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-08-26 02:04:48,094 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-08-26 02:04:48,095 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-08-26 02:04:48,095 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-08-26 02:04:48,095 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-08-26 02:04:48,095 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-08-26 02:04:48,095 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-08-26 02:04:48,095 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-26 02:04:48,095 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-26 02:04:48,479 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-26 02:04:48,480 INFO L299 CfgBuilder]: Removed 14 assume(true) statements. [2021-08-26 02:04:48,481 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 02:04:48 BoogieIcfgContainer [2021-08-26 02:04:48,481 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-26 02:04:48,482 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-26 02:04:48,482 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-26 02:04:48,484 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-26 02:04:48,484 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 02:04:47" (1/3) ... [2021-08-26 02:04:48,485 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68be820b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 02:04:48, skipping insertion in model container [2021-08-26 02:04:48,485 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 02:04:47" (2/3) ... [2021-08-26 02:04:48,485 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68be820b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 02:04:48, skipping insertion in model container [2021-08-26 02:04:48,485 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 02:04:48" (3/3) ... [2021-08-26 02:04:48,486 INFO L111 eAbstractionObserver]: Analyzing ICFG list-2.i [2021-08-26 02:04:48,491 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-26 02:04:48,492 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-26 02:04:48,525 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-26 02:04:48,531 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-08-26 02:04:48,531 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-08-26 02:04:48,541 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 26 states have (on average 1.5) internal successors, (39), 27 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:48,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-08-26 02:04:48,544 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:04:48,544 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:04:48,545 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 02:04:48,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:04:48,548 INFO L82 PathProgramCache]: Analyzing trace with hash 1661254537, now seen corresponding path program 1 times [2021-08-26 02:04:48,553 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:04:48,554 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1623436546] [2021-08-26 02:04:48,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:04:48,554 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:04:48,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:04:48,681 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:04:48,682 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:04:48,682 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1623436546] [2021-08-26 02:04:48,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1623436546] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 02:04:48,683 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 02:04:48,683 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-08-26 02:04:48,685 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313267164] [2021-08-26 02:04:48,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-08-26 02:04:48,688 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:04:48,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-08-26 02:04:48,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-08-26 02:04:48,700 INFO L87 Difference]: Start difference. First operand has 28 states, 26 states have (on average 1.5) internal successors, (39), 27 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:48,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:04:48,710 INFO L93 Difference]: Finished difference Result 46 states and 64 transitions. [2021-08-26 02:04:48,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-08-26 02:04:48,711 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 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 12 [2021-08-26 02:04:48,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:04:48,716 INFO L225 Difference]: With dead ends: 46 [2021-08-26 02:04:48,716 INFO L226 Difference]: Without dead ends: 21 [2021-08-26 02:04:48,718 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0ms TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-08-26 02:04:48,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-08-26 02:04:48,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-08-26 02:04:48,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:48,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2021-08-26 02:04:48,739 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 12 [2021-08-26 02:04:48,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:04:48,739 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2021-08-26 02:04:48,739 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:48,739 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2021-08-26 02:04:48,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-08-26 02:04:48,740 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:04:48,740 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:04:48,741 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-26 02:04:48,741 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 02:04:48,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:04:48,744 INFO L82 PathProgramCache]: Analyzing trace with hash 57591681, now seen corresponding path program 1 times [2021-08-26 02:04:48,744 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:04:48,744 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2126416265] [2021-08-26 02:04:48,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:04:48,745 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:04:48,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:04:48,837 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:04:48,837 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:04:48,837 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2126416265] [2021-08-26 02:04:48,838 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2126416265] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 02:04:48,838 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 02:04:48,838 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-26 02:04:48,838 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37179383] [2021-08-26 02:04:48,839 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-26 02:04:48,839 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:04:48,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-26 02:04:48,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 02:04:48,841 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:48,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:04:48,947 INFO L93 Difference]: Finished difference Result 46 states and 53 transitions. [2021-08-26 02:04:48,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-26 02:04:48,948 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-08-26 02:04:48,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:04:48,949 INFO L225 Difference]: With dead ends: 46 [2021-08-26 02:04:48,950 INFO L226 Difference]: Without dead ends: 42 [2021-08-26 02:04:48,950 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 30.0ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-08-26 02:04:48,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-08-26 02:04:48,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 30. [2021-08-26 02:04:48,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:48,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-08-26 02:04:48,965 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 16 [2021-08-26 02:04:48,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:04:48,965 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-08-26 02:04:48,965 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:48,965 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-08-26 02:04:48,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-08-26 02:04:48,966 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:04:48,966 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:04:48,967 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-08-26 02:04:48,967 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 02:04:48,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:04:48,973 INFO L82 PathProgramCache]: Analyzing trace with hash -440293124, now seen corresponding path program 1 times [2021-08-26 02:04:48,973 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:04:48,973 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973911791] [2021-08-26 02:04:48,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:04:48,974 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:04:48,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:04:49,050 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:04:49,051 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:04:49,051 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973911791] [2021-08-26 02:04:49,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1973911791] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 02:04:49,052 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 02:04:49,052 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-26 02:04:49,053 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208062551] [2021-08-26 02:04:49,054 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-26 02:04:49,054 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:04:49,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-26 02:04:49,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 02:04:49,059 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:49,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:04:49,138 INFO L93 Difference]: Finished difference Result 48 states and 55 transitions. [2021-08-26 02:04:49,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-26 02:04:49,139 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-08-26 02:04:49,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:04:49,140 INFO L225 Difference]: With dead ends: 48 [2021-08-26 02:04:49,140 INFO L226 Difference]: Without dead ends: 40 [2021-08-26 02:04:49,140 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 30.9ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-08-26 02:04:49,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-08-26 02:04:49,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 28. [2021-08-26 02:04:49,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 27 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:49,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2021-08-26 02:04:49,143 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 18 [2021-08-26 02:04:49,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:04:49,143 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2021-08-26 02:04:49,143 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:49,144 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2021-08-26 02:04:49,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-08-26 02:04:49,144 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:04:49,144 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:04:49,144 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-08-26 02:04:49,144 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 02:04:49,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:04:49,145 INFO L82 PathProgramCache]: Analyzing trace with hash 584409852, now seen corresponding path program 1 times [2021-08-26 02:04:49,145 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:04:49,145 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214218873] [2021-08-26 02:04:49,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:04:49,146 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:04:49,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:04:49,183 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:04:49,184 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:04:49,184 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1214218873] [2021-08-26 02:04:49,184 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1214218873] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 02:04:49,184 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 02:04:49,184 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-26 02:04:49,184 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355848454] [2021-08-26 02:04:49,185 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-26 02:04:49,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:04:49,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-26 02:04:49,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 02:04:49,186 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:49,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:04:49,232 INFO L93 Difference]: Finished difference Result 48 states and 55 transitions. [2021-08-26 02:04:49,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-26 02:04:49,232 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-08-26 02:04:49,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:04:49,233 INFO L225 Difference]: With dead ends: 48 [2021-08-26 02:04:49,233 INFO L226 Difference]: Without dead ends: 37 [2021-08-26 02:04:49,233 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 21.0ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-08-26 02:04:49,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-08-26 02:04:49,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 25. [2021-08-26 02:04:49,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:49,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2021-08-26 02:04:49,236 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 18 [2021-08-26 02:04:49,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:04:49,236 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2021-08-26 02:04:49,236 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:49,236 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2021-08-26 02:04:49,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-08-26 02:04:49,237 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:04:49,237 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:04:49,237 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-08-26 02:04:49,237 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 02:04:49,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:04:49,238 INFO L82 PathProgramCache]: Analyzing trace with hash -1573518424, now seen corresponding path program 1 times [2021-08-26 02:04:49,238 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:04:49,238 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073643356] [2021-08-26 02:04:49,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:04:49,238 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:04:49,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:04:49,332 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:04:49,332 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:04:49,332 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073643356] [2021-08-26 02:04:49,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2073643356] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:04:49,333 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1023300764] [2021-08-26 02:04:49,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:04:49,333 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:04:49,333 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 02:04:49,334 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 02:04:49,335 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-08-26 02:04:49,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:04:49,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 22 conjunts are in the unsatisfiable core [2021-08-26 02:04:49,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 02:04:49,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-26 02:04:49,556 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-08-26 02:04:49,567 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-08-26 02:04:49,567 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-08-26 02:04:49,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-26 02:04:49,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 11 [2021-08-26 02:04:49,671 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-08-26 02:04:49,672 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-08-26 02:04:49,715 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-08-26 02:04:49,715 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 14 [2021-08-26 02:04:49,740 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:04:49,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1023300764] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:04:49,741 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 02:04:49,741 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2021-08-26 02:04:49,741 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961553130] [2021-08-26 02:04:49,741 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-08-26 02:04:49,742 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:04:49,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-08-26 02:04:49,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-08-26 02:04:49,743 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:49,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:04:49,903 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2021-08-26 02:04:49,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-08-26 02:04:49,903 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-08-26 02:04:49,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:04:49,904 INFO L225 Difference]: With dead ends: 50 [2021-08-26 02:04:49,904 INFO L226 Difference]: Without dead ends: 44 [2021-08-26 02:04:49,904 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 162.8ms TimeCoverageRelationStatistics Valid=83, Invalid=259, Unknown=0, NotChecked=0, Total=342 [2021-08-26 02:04:49,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-08-26 02:04:49,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 32. [2021-08-26 02:04:49,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.1935483870967742) internal successors, (37), 31 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:49,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2021-08-26 02:04:49,907 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 20 [2021-08-26 02:04:49,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:04:49,908 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2021-08-26 02:04:49,908 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:49,908 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2021-08-26 02:04:49,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-08-26 02:04:49,909 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:04:49,909 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:04:49,952 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-08-26 02:04:50,126 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:04:50,127 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 02:04:50,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:04:50,127 INFO L82 PathProgramCache]: Analyzing trace with hash -710116760, now seen corresponding path program 1 times [2021-08-26 02:04:50,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:04:50,128 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917532967] [2021-08-26 02:04:50,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:04:50,128 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:04:50,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:04:50,216 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:04:50,217 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:04:50,217 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917532967] [2021-08-26 02:04:50,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1917532967] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:04:50,217 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [131446517] [2021-08-26 02:04:50,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:04:50,218 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:04:50,218 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 02:04:50,219 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 02:04:50,220 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-08-26 02:04:50,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:04:50,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 24 conjunts are in the unsatisfiable core [2021-08-26 02:04:50,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 02:04:50,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-26 02:04:50,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-08-26 02:04:50,383 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-08-26 02:04:50,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-08-26 02:04:50,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-26 02:04:50,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 11 [2021-08-26 02:04:50,512 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-08-26 02:04:50,512 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-08-26 02:04:50,583 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-08-26 02:04:50,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 14 [2021-08-26 02:04:50,592 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:04:50,593 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [131446517] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:04:50,593 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 02:04:50,593 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2021-08-26 02:04:50,593 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3824392] [2021-08-26 02:04:50,593 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-08-26 02:04:50,593 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:04:50,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-08-26 02:04:50,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-08-26 02:04:50,594 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:50,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:04:50,784 INFO L93 Difference]: Finished difference Result 59 states and 68 transitions. [2021-08-26 02:04:50,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-08-26 02:04:50,785 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-08-26 02:04:50,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:04:50,785 INFO L225 Difference]: With dead ends: 59 [2021-08-26 02:04:50,786 INFO L226 Difference]: Without dead ends: 55 [2021-08-26 02:04:50,786 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 197.0ms TimeCoverageRelationStatistics Valid=83, Invalid=259, Unknown=0, NotChecked=0, Total=342 [2021-08-26 02:04:50,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-08-26 02:04:50,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 43. [2021-08-26 02:04:50,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.2142857142857142) internal successors, (51), 42 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:50,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2021-08-26 02:04:50,789 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 20 [2021-08-26 02:04:50,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:04:50,790 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2021-08-26 02:04:50,790 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 13 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:50,790 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2021-08-26 02:04:50,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-08-26 02:04:50,790 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:04:50,790 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:04:50,810 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-08-26 02:04:51,008 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-08-26 02:04:51,008 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 02:04:51,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:04:51,008 INFO L82 PathProgramCache]: Analyzing trace with hash 750661987, now seen corresponding path program 1 times [2021-08-26 02:04:51,009 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:04:51,009 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534138171] [2021-08-26 02:04:51,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:04:51,009 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:04:51,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:04:51,120 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:04:51,121 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:04:51,121 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534138171] [2021-08-26 02:04:51,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [534138171] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:04:51,121 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [851394024] [2021-08-26 02:04:51,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:04:51,121 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:04:51,121 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 02:04:51,122 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 02:04:51,123 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-08-26 02:04:51,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:04:51,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 29 conjunts are in the unsatisfiable core [2021-08-26 02:04:51,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 02:04:51,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-26 02:04:51,318 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-08-26 02:04:51,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-08-26 02:04:51,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-08-26 02:04:51,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-08-26 02:04:51,416 INFO L354 Elim1Store]: treesize reduction 53, result has 14.5 percent of original size [2021-08-26 02:04:51,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 130 treesize of output 84 [2021-08-26 02:04:51,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 75 [2021-08-26 02:04:51,428 INFO L354 Elim1Store]: treesize reduction 53, result has 14.5 percent of original size [2021-08-26 02:04:51,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 75 treesize of output 59 [2021-08-26 02:04:51,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 30 [2021-08-26 02:04:51,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2021-08-26 02:04:51,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-08-26 02:04:51,483 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:04:51,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [851394024] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:04:51,483 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 02:04:51,483 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2021-08-26 02:04:51,484 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408981785] [2021-08-26 02:04:51,484 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-08-26 02:04:51,484 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:04:51,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-08-26 02:04:51,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2021-08-26 02:04:51,485 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand has 14 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 14 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:51,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:04:51,678 INFO L93 Difference]: Finished difference Result 63 states and 73 transitions. [2021-08-26 02:04:51,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-08-26 02:04:51,679 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 14 states have internal predecessors, (36), 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 22 [2021-08-26 02:04:51,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:04:51,679 INFO L225 Difference]: With dead ends: 63 [2021-08-26 02:04:51,679 INFO L226 Difference]: Without dead ends: 59 [2021-08-26 02:04:51,680 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 154.3ms TimeCoverageRelationStatistics Valid=72, Invalid=270, Unknown=0, NotChecked=0, Total=342 [2021-08-26 02:04:51,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-08-26 02:04:51,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 47. [2021-08-26 02:04:51,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.2173913043478262) internal successors, (56), 46 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:51,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 56 transitions. [2021-08-26 02:04:51,684 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 56 transitions. Word has length 22 [2021-08-26 02:04:51,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:04:51,684 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 56 transitions. [2021-08-26 02:04:51,684 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 14 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:51,684 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 56 transitions. [2021-08-26 02:04:51,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-08-26 02:04:51,685 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:04:51,685 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:04:51,705 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-08-26 02:04:51,902 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:04:51,903 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 02:04:51,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:04:51,903 INFO L82 PathProgramCache]: Analyzing trace with hash -119659938, now seen corresponding path program 1 times [2021-08-26 02:04:51,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:04:51,903 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1542447472] [2021-08-26 02:04:51,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:04:51,903 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:04:51,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:04:52,003 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:04:52,004 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:04:52,004 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1542447472] [2021-08-26 02:04:52,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1542447472] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:04:52,004 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1401078104] [2021-08-26 02:04:52,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:04:52,005 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:04:52,005 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 02:04:52,005 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 02:04:52,007 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-08-26 02:04:52,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:04:52,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 28 conjunts are in the unsatisfiable core [2021-08-26 02:04:52,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 02:04:52,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-26 02:04:52,198 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-08-26 02:04:52,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-08-26 02:04:52,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-08-26 02:04:52,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-08-26 02:04:52,284 INFO L354 Elim1Store]: treesize reduction 53, result has 14.5 percent of original size [2021-08-26 02:04:52,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 130 treesize of output 84 [2021-08-26 02:04:52,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 75 [2021-08-26 02:04:52,295 INFO L354 Elim1Store]: treesize reduction 53, result has 14.5 percent of original size [2021-08-26 02:04:52,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 75 treesize of output 59 [2021-08-26 02:04:52,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 30 [2021-08-26 02:04:52,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2021-08-26 02:04:52,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-08-26 02:04:52,348 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:04:52,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1401078104] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:04:52,348 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 02:04:52,348 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2021-08-26 02:04:52,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988009945] [2021-08-26 02:04:52,349 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-08-26 02:04:52,349 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:04:52,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-08-26 02:04:52,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2021-08-26 02:04:52,349 INFO L87 Difference]: Start difference. First operand 47 states and 56 transitions. Second operand has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 14 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:52,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:04:52,540 INFO L93 Difference]: Finished difference Result 65 states and 75 transitions. [2021-08-26 02:04:52,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-08-26 02:04:52,541 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 14 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-08-26 02:04:52,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:04:52,541 INFO L225 Difference]: With dead ends: 65 [2021-08-26 02:04:52,542 INFO L226 Difference]: Without dead ends: 55 [2021-08-26 02:04:52,542 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 147.7ms TimeCoverageRelationStatistics Valid=72, Invalid=270, Unknown=0, NotChecked=0, Total=342 [2021-08-26 02:04:52,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-08-26 02:04:52,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 38. [2021-08-26 02:04:52,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.1891891891891893) internal successors, (44), 37 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:52,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 44 transitions. [2021-08-26 02:04:52,545 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 44 transitions. Word has length 24 [2021-08-26 02:04:52,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:04:52,545 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 44 transitions. [2021-08-26 02:04:52,545 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 14 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:52,545 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 44 transitions. [2021-08-26 02:04:52,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-08-26 02:04:52,546 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:04:52,546 INFO L512 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:04:52,565 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-08-26 02:04:52,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:04:52,763 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 02:04:52,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:04:52,764 INFO L82 PathProgramCache]: Analyzing trace with hash 905043038, now seen corresponding path program 2 times [2021-08-26 02:04:52,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:04:52,764 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1370902058] [2021-08-26 02:04:52,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:04:52,764 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:04:52,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:04:52,864 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:04:52,864 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:04:52,865 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1370902058] [2021-08-26 02:04:52,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1370902058] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:04:52,865 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1717457665] [2021-08-26 02:04:52,865 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-26 02:04:52,865 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:04:52,865 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 02:04:52,872 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 02:04:52,873 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-08-26 02:04:53,016 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-26 02:04:53,016 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 02:04:53,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 28 conjunts are in the unsatisfiable core [2021-08-26 02:04:53,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 02:04:53,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-26 02:04:53,095 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-08-26 02:04:53,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-08-26 02:04:53,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-08-26 02:04:53,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-08-26 02:04:53,187 INFO L354 Elim1Store]: treesize reduction 53, result has 14.5 percent of original size [2021-08-26 02:04:53,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 130 treesize of output 84 [2021-08-26 02:04:53,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 75 [2021-08-26 02:04:53,197 INFO L354 Elim1Store]: treesize reduction 53, result has 14.5 percent of original size [2021-08-26 02:04:53,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 75 treesize of output 59 [2021-08-26 02:04:53,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 30 [2021-08-26 02:04:53,229 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2021-08-26 02:04:53,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-08-26 02:04:53,249 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:04:53,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1717457665] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:04:53,249 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 02:04:53,249 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2021-08-26 02:04:53,249 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300957343] [2021-08-26 02:04:53,250 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-08-26 02:04:53,250 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:04:53,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-08-26 02:04:53,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2021-08-26 02:04:53,251 INFO L87 Difference]: Start difference. First operand 38 states and 44 transitions. Second operand has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 14 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:53,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:04:53,431 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2021-08-26 02:04:53,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-08-26 02:04:53,432 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 14 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-08-26 02:04:53,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:04:53,432 INFO L225 Difference]: With dead ends: 58 [2021-08-26 02:04:53,432 INFO L226 Difference]: Without dead ends: 45 [2021-08-26 02:04:53,433 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 163.7ms TimeCoverageRelationStatistics Valid=72, Invalid=270, Unknown=0, NotChecked=0, Total=342 [2021-08-26 02:04:53,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-08-26 02:04:53,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 33. [2021-08-26 02:04:53,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.1875) internal successors, (38), 32 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:53,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2021-08-26 02:04:53,435 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 24 [2021-08-26 02:04:53,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:04:53,435 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2021-08-26 02:04:53,435 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 14 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:04:53,435 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2021-08-26 02:04:53,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-08-26 02:04:53,436 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:04:53,436 INFO L512 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:04:53,453 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-08-26 02:04:53,653 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:04:53,654 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 02:04:53,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:04:53,654 INFO L82 PathProgramCache]: Analyzing trace with hash -719006641, now seen corresponding path program 2 times [2021-08-26 02:04:53,654 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:04:53,654 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35708879] [2021-08-26 02:04:53,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:04:53,655 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:04:53,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:04:53,791 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:04:53,792 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:04:53,792 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35708879] [2021-08-26 02:04:53,792 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [35708879] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:04:53,792 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [982508387] [2021-08-26 02:04:53,792 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-26 02:04:53,792 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:04:53,793 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 02:04:53,793 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 02:04:53,794 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-08-26 02:04:53,940 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-26 02:04:53,940 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 02:04:53,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 32 conjunts are in the unsatisfiable core [2021-08-26 02:04:53,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 02:04:53,949 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-26 02:04:54,021 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-08-26 02:04:54,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-08-26 02:04:54,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-08-26 02:04:54,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-26 02:04:54,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 11 [2021-08-26 02:04:54,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-26 02:04:54,091 INFO L388 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 19 treesize of output 18 [2021-08-26 02:04:54,156 INFO L354 Elim1Store]: treesize reduction 72, result has 17.2 percent of original size [2021-08-26 02:04:54,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 25 [2021-08-26 02:04:54,250 INFO L354 Elim1Store]: treesize reduction 40, result has 40.3 percent of original size [2021-08-26 02:04:54,251 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 30 treesize of output 44 [2021-08-26 02:04:56,623 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-08-26 02:04:56,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 14 [2021-08-26 02:04:56,628 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:04:56,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [982508387] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:04:56,629 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 02:04:56,629 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2021-08-26 02:04:56,629 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005722917] [2021-08-26 02:04:56,629 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-08-26 02:04:56,629 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:04:56,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-08-26 02:04:56,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=219, Unknown=1, NotChecked=0, Total=272 [2021-08-26 02:04:56,630 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:05:21,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:05:21,160 INFO L93 Difference]: Finished difference Result 77 states and 89 transitions. [2021-08-26 02:05:21,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-08-26 02:05:21,160 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 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 24 [2021-08-26 02:05:21,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:05:21,161 INFO L225 Difference]: With dead ends: 77 [2021-08-26 02:05:21,161 INFO L226 Difference]: Without dead ends: 71 [2021-08-26 02:05:21,161 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 14484.2ms TimeCoverageRelationStatistics Valid=224, Invalid=825, Unknown=7, NotChecked=0, Total=1056 [2021-08-26 02:05:21,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-08-26 02:05:21,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 48. [2021-08-26 02:05:21,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.1914893617021276) internal successors, (56), 47 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:05:21,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2021-08-26 02:05:21,164 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 24 [2021-08-26 02:05:21,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:05:21,164 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2021-08-26 02:05:21,165 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:05:21,165 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2021-08-26 02:05:21,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-08-26 02:05:21,165 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:05:21,165 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:05:21,183 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-08-26 02:05:21,372 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:05:21,373 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 02:05:21,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:05:21,373 INFO L82 PathProgramCache]: Analyzing trace with hash -419304689, now seen corresponding path program 1 times [2021-08-26 02:05:21,373 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:05:21,373 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1903797640] [2021-08-26 02:05:21,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:05:21,374 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:05:21,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:05:21,535 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:05:21,536 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:05:21,536 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1903797640] [2021-08-26 02:05:21,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1903797640] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:05:21,536 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1361965410] [2021-08-26 02:05:21,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:05:21,536 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:05:21,536 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 02:05:21,537 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 02:05:21,538 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-08-26 02:05:21,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:05:21,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 32 conjunts are in the unsatisfiable core [2021-08-26 02:05:21,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 02:05:21,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-26 02:05:21,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-08-26 02:05:21,788 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-08-26 02:05:21,788 INFO L388 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 [2021-08-26 02:05:21,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-26 02:05:21,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 11 [2021-08-26 02:05:21,923 INFO L388 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 19 treesize of output 18 [2021-08-26 02:05:21,936 INFO L354 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2021-08-26 02:05:21,936 INFO L388 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 16 treesize of output 18 [2021-08-26 02:05:22,000 INFO L354 Elim1Store]: treesize reduction 72, result has 17.2 percent of original size [2021-08-26 02:05:22,001 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 42 treesize of output 29 [2021-08-26 02:05:22,100 INFO L354 Elim1Store]: treesize reduction 60, result has 20.0 percent of original size [2021-08-26 02:05:22,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 40 [2021-08-26 02:05:22,256 INFO L354 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2021-08-26 02:05:22,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 41 treesize of output 25 [2021-08-26 02:05:22,277 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:05:22,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1361965410] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:05:22,277 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 02:05:22,277 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 18 [2021-08-26 02:05:22,277 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626092719] [2021-08-26 02:05:22,278 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-08-26 02:05:22,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:05:22,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-08-26 02:05:22,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-08-26 02:05:22,279 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:05:22,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:05:22,646 INFO L93 Difference]: Finished difference Result 96 states and 112 transitions. [2021-08-26 02:05:22,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-08-26 02:05:22,646 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 18 states have internal predecessors, (42), 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 24 [2021-08-26 02:05:22,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:05:22,647 INFO L225 Difference]: With dead ends: 96 [2021-08-26 02:05:22,647 INFO L226 Difference]: Without dead ends: 90 [2021-08-26 02:05:22,647 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 362.0ms TimeCoverageRelationStatistics Valid=178, Invalid=692, Unknown=0, NotChecked=0, Total=870 [2021-08-26 02:05:22,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-08-26 02:05:22,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 50. [2021-08-26 02:05:22,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2040816326530612) internal successors, (59), 49 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:05:22,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 59 transitions. [2021-08-26 02:05:22,656 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 59 transitions. Word has length 24 [2021-08-26 02:05:22,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:05:22,656 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 59 transitions. [2021-08-26 02:05:22,656 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:05:22,656 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 59 transitions. [2021-08-26 02:05:22,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-08-26 02:05:22,658 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:05:22,658 INFO L512 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:05:22,675 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-08-26 02:05:22,858 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:05:22,859 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 02:05:22,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:05:22,859 INFO L82 PathProgramCache]: Analyzing trace with hash 573028938, now seen corresponding path program 1 times [2021-08-26 02:05:22,859 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:05:22,859 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1522886859] [2021-08-26 02:05:22,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:05:22,859 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:05:22,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:05:23,033 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:05:23,034 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:05:23,034 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1522886859] [2021-08-26 02:05:23,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1522886859] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:05:23,034 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [733397997] [2021-08-26 02:05:23,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:05:23,034 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:05:23,035 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 02:05:23,035 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 02:05:23,036 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-08-26 02:05:23,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:05:23,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 31 conjunts are in the unsatisfiable core [2021-08-26 02:05:23,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 02:05:23,260 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-26 02:05:23,330 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-08-26 02:05:23,331 INFO L388 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 [2021-08-26 02:05:23,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-08-26 02:05:23,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-26 02:05:23,394 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 11 [2021-08-26 02:05:23,440 INFO L388 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 19 treesize of output 18 [2021-08-26 02:05:23,455 INFO L354 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2021-08-26 02:05:23,455 INFO L388 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 16 treesize of output 18 [2021-08-26 02:05:23,527 INFO L354 Elim1Store]: treesize reduction 72, result has 17.2 percent of original size [2021-08-26 02:05:23,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 42 treesize of output 29 [2021-08-26 02:05:23,624 INFO L354 Elim1Store]: treesize reduction 60, result has 20.0 percent of original size [2021-08-26 02:05:23,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 40 [2021-08-26 02:05:23,767 INFO L354 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2021-08-26 02:05:23,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 41 treesize of output 25 [2021-08-26 02:05:23,789 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:05:23,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [733397997] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:05:23,790 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 02:05:23,790 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 18 [2021-08-26 02:05:23,790 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444960015] [2021-08-26 02:05:23,790 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-08-26 02:05:23,790 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:05:23,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-08-26 02:05:23,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-08-26 02:05:23,791 INFO L87 Difference]: Start difference. First operand 50 states and 59 transitions. Second operand has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:05:24,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:05:24,183 INFO L93 Difference]: Finished difference Result 94 states and 109 transitions. [2021-08-26 02:05:24,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-08-26 02:05:24,184 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-08-26 02:05:24,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:05:24,184 INFO L225 Difference]: With dead ends: 94 [2021-08-26 02:05:24,184 INFO L226 Difference]: Without dead ends: 84 [2021-08-26 02:05:24,185 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 395.4ms TimeCoverageRelationStatistics Valid=181, Invalid=689, Unknown=0, NotChecked=0, Total=870 [2021-08-26 02:05:24,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-08-26 02:05:24,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 63. [2021-08-26 02:05:24,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.1935483870967742) internal successors, (74), 62 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:05:24,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 74 transitions. [2021-08-26 02:05:24,188 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 74 transitions. Word has length 26 [2021-08-26 02:05:24,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:05:24,188 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 74 transitions. [2021-08-26 02:05:24,188 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:05:24,188 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 74 transitions. [2021-08-26 02:05:24,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-08-26 02:05:24,189 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:05:24,189 INFO L512 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:05:24,209 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-08-26 02:05:24,396 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-08-26 02:05:24,397 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 02:05:24,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:05:24,397 INFO L82 PathProgramCache]: Analyzing trace with hash 1597731914, now seen corresponding path program 3 times [2021-08-26 02:05:24,397 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:05:24,397 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [867228972] [2021-08-26 02:05:24,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:05:24,397 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:05:24,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 02:05:24,595 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:05:24,595 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 02:05:24,595 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [867228972] [2021-08-26 02:05:24,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [867228972] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:05:24,596 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1182866723] [2021-08-26 02:05:24,596 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-08-26 02:05:24,596 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 02:05:24,596 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 02:05:24,597 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 02:05:24,598 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-08-26 02:05:24,872 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-08-26 02:05:24,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 02:05:24,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 47 conjunts are in the unsatisfiable core [2021-08-26 02:05:24,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 02:05:24,978 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-08-26 02:05:24,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-08-26 02:05:25,034 INFO L354 Elim1Store]: treesize reduction 35, result has 20.5 percent of original size [2021-08-26 02:05:25,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 16 [2021-08-26 02:05:25,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-26 02:05:25,042 INFO L388 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 25 treesize of output 13 [2021-08-26 02:05:25,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-08-26 02:05:25,102 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-26 02:05:25,111 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-08-26 02:05:25,112 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 128 treesize of output 80 [2021-08-26 02:05:25,114 INFO L388 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 70 treesize of output 58 [2021-08-26 02:05:25,116 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-26 02:05:25,122 INFO L354 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-08-26 02:05:25,123 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 54 [2021-08-26 02:05:25,272 INFO L354 Elim1Store]: treesize reduction 64, result has 19.0 percent of original size [2021-08-26 02:05:25,273 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 117 treesize of output 95 [2021-08-26 02:05:25,289 INFO L354 Elim1Store]: treesize reduction 80, result has 19.2 percent of original size [2021-08-26 02:05:25,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 102 treesize of output 81 [2021-08-26 02:05:25,316 INFO L354 Elim1Store]: treesize reduction 48, result has 47.3 percent of original size [2021-08-26 02:05:25,316 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 87 treesize of output 113 [2021-08-26 02:05:25,558 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-08-26 02:05:25,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 107 treesize of output 74 [2021-08-26 02:05:25,563 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-08-26 02:05:25,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 68 treesize of output 48 [2021-08-26 02:05:25,749 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-08-26 02:05:25,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 14 [2021-08-26 02:05:25,770 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 02:05:25,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1182866723] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 02:05:25,771 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 02:05:25,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14] total 24 [2021-08-26 02:05:25,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201803258] [2021-08-26 02:05:25,772 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-08-26 02:05:25,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 02:05:25,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-08-26 02:05:25,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=481, Unknown=0, NotChecked=0, Total=552 [2021-08-26 02:05:25,772 INFO L87 Difference]: Start difference. First operand 63 states and 74 transitions. Second operand has 24 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:05:26,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 02:05:26,960 INFO L93 Difference]: Finished difference Result 99 states and 115 transitions. [2021-08-26 02:05:26,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-08-26 02:05:26,960 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 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 26 [2021-08-26 02:05:26,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 02:05:26,961 INFO L225 Difference]: With dead ends: 99 [2021-08-26 02:05:26,961 INFO L226 Difference]: Without dead ends: 91 [2021-08-26 02:05:26,962 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 1235.2ms TimeCoverageRelationStatistics Valid=246, Invalid=1476, Unknown=0, NotChecked=0, Total=1722 [2021-08-26 02:05:26,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-08-26 02:05:26,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 71. [2021-08-26 02:05:26,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.1857142857142857) internal successors, (83), 70 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:05:26,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 83 transitions. [2021-08-26 02:05:26,966 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 83 transitions. Word has length 26 [2021-08-26 02:05:26,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 02:05:26,966 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 83 transitions. [2021-08-26 02:05:26,966 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-26 02:05:26,966 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 83 transitions. [2021-08-26 02:05:26,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-08-26 02:05:26,967 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 02:05:26,967 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 02:05:26,988 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-08-26 02:05:27,176 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-08-26 02:05:27,177 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 02:05:27,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 02:05:27,177 INFO L82 PathProgramCache]: Analyzing trace with hash 823795978, now seen corresponding path program 1 times [2021-08-26 02:05:27,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 02:05:27,177 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [766294234] [2021-08-26 02:05:27,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 02:05:27,177 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 02:05:27,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-26 02:05:27,196 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-26 02:05:27,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-26 02:05:27,217 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-26 02:05:27,218 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-08-26 02:05:27,218 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-08-26 02:05:27,219 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-08-26 02:05:27,223 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-26 02:05:27,252 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.08 02:05:27 BoogieIcfgContainer [2021-08-26 02:05:27,253 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-26 02:05:27,253 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-26 02:05:27,253 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-26 02:05:27,253 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-26 02:05:27,254 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 02:04:48" (3/4) ... [2021-08-26 02:05:27,255 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-08-26 02:05:27,283 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-08-26 02:05:27,283 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-26 02:05:27,284 INFO L168 Benchmark]: Toolchain (without parser) took 39690.25 ms. Allocated memory was 65.0 MB in the beginning and 251.7 MB in the end (delta: 186.6 MB). Free memory was 44.3 MB in the beginning and 217.8 MB in the end (delta: -173.5 MB). Peak memory consumption was 12.4 MB. Max. memory is 16.1 GB. [2021-08-26 02:05:27,284 INFO L168 Benchmark]: CDTParser took 0.09 ms. Allocated memory is still 65.0 MB. Free memory is still 47.1 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 02:05:27,284 INFO L168 Benchmark]: CACSL2BoogieTranslator took 367.33 ms. Allocated memory is still 65.0 MB. Free memory was 44.2 MB in the beginning and 42.2 MB in the end (delta: 2.0 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-08-26 02:05:27,284 INFO L168 Benchmark]: Boogie Procedure Inliner took 38.77 ms. Allocated memory is still 65.0 MB. Free memory was 42.0 MB in the beginning and 40.2 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-08-26 02:05:27,285 INFO L168 Benchmark]: Boogie Preprocessor took 28.07 ms. Allocated memory is still 65.0 MB. Free memory was 40.2 MB in the beginning and 38.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-08-26 02:05:27,285 INFO L168 Benchmark]: RCFGBuilder took 451.30 ms. Allocated memory is still 65.0 MB. Free memory was 38.6 MB in the beginning and 36.2 MB in the end (delta: 2.5 MB). Peak memory consumption was 12.4 MB. Max. memory is 16.1 GB. [2021-08-26 02:05:27,285 INFO L168 Benchmark]: TraceAbstraction took 38770.34 ms. Allocated memory was 65.0 MB in the beginning and 251.7 MB in the end (delta: 186.6 MB). Free memory was 35.7 MB in the beginning and 219.9 MB in the end (delta: -184.3 MB). Peak memory consumption was 3.2 MB. Max. memory is 16.1 GB. [2021-08-26 02:05:27,285 INFO L168 Benchmark]: Witness Printer took 29.97 ms. Allocated memory is still 251.7 MB. Free memory was 219.9 MB in the beginning and 217.8 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-08-26 02:05:27,287 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.09 ms. Allocated memory is still 65.0 MB. Free memory is still 47.1 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 367.33 ms. Allocated memory is still 65.0 MB. Free memory was 44.2 MB in the beginning and 42.2 MB in the end (delta: 2.0 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 38.77 ms. Allocated memory is still 65.0 MB. Free memory was 42.0 MB in the beginning and 40.2 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 28.07 ms. Allocated memory is still 65.0 MB. Free memory was 40.2 MB in the beginning and 38.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 451.30 ms. Allocated memory is still 65.0 MB. Free memory was 38.6 MB in the beginning and 36.2 MB in the end (delta: 2.5 MB). Peak memory consumption was 12.4 MB. Max. memory is 16.1 GB. * TraceAbstraction took 38770.34 ms. Allocated memory was 65.0 MB in the beginning and 251.7 MB in the end (delta: 186.6 MB). Free memory was 35.7 MB in the beginning and 219.9 MB in the end (delta: -184.3 MB). Peak memory consumption was 3.2 MB. Max. memory is 16.1 GB. * Witness Printer took 29.97 ms. Allocated memory is still 251.7 MB. Free memory was 219.9 MB in the beginning and 217.8 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 557]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L532] List a = (List) malloc(sizeof(struct node)); [L533] COND FALSE !(a == 0) [L534] List t; [L535] List p = a; [L536] COND TRUE __VERIFIER_nondet_int() [L537] p->h = 1 [L538] t = (List) malloc(sizeof(struct node)) [L539] COND FALSE !(t == 0) [L540] p->n = t [L541] EXPR p->n [L541] p = p->n [L536] COND FALSE !(__VERIFIER_nondet_int()) [L543] COND TRUE __VERIFIER_nondet_int() [L544] p->h = 2 [L545] t = (List) malloc(sizeof(struct node)) [L546] COND FALSE !(t == 0) [L547] p->n = t [L548] EXPR p->n [L548] p = p->n [L543] COND FALSE !(__VERIFIER_nondet_int()) [L550] p->h = 3 [L551] p = a [L552] EXPR p->h [L552] COND FALSE !(p->h == 2) [L554] EXPR p->h [L554] COND TRUE p->h == 1 [L555] EXPR p->n [L555] p = p->n [L554] EXPR p->h [L554] COND FALSE !(p->h == 1) [L556] EXPR p->h [L556] COND TRUE p->h != 3 [L557] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 38698.0ms, OverallIterations: 14, TraceHistogramMax: 3, EmptinessCheckTime: 13.5ms, AutomataDifference: 27684.2ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 7.0ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 239 SDtfs, 780 SDslu, 1221 SDs, 0 SdLazy, 2180 SolverSat, 343 SolverUnsat, 6 SolverUnknown, 0 SolverNotchecked, 13221.9ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 400 GetRequests, 171 SyntacticMatches, 2 SemanticMatches, 227 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1032 ImplicationChecksByTransitivity, 17384.7ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=71occurred in iteration=13, InterpolantAutomatonStates: 142, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 62.9ms AutomataMinimizationTime, 13 MinimizatonAttempts, 205 StatesRemovedByMinimization, 12 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 114.9ms SsaConstructionTime, 261.2ms SatisfiabilityAnalysisTime, 7259.1ms InterpolantComputationTime, 510 NumberOfCodeBlocks, 510 NumberOfCodeBlocksAsserted, 27 NumberOfCheckSat, 462 ConstructedInterpolants, 29 QuantifiedInterpolants, 6178 SizeOfPredicates, 83 NumberOfNonLiveVariables, 909 ConjunctsInSsa, 273 ConjunctsInUnsatCore, 22 InterpolantComputations, 4 PerfectInterpolantSequences, 20/112 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-08-26 02:05:27,308 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...