./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/invert_string-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops/invert_string-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer --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 1b9a71645175fee79e6d6cd797db38ce6044ffb9 .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 0.2.0-a4ecdab [2020-11-28 02:58:00,364 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-28 02:58:00,365 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-28 02:58:00,429 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-28 02:58:00,430 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-28 02:58:00,432 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-28 02:58:00,434 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-28 02:58:00,436 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-28 02:58:00,439 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-28 02:58:00,440 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-28 02:58:00,441 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-28 02:58:00,443 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-28 02:58:00,443 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-28 02:58:00,445 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-28 02:58:00,446 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-28 02:58:00,448 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-28 02:58:00,449 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-28 02:58:00,453 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-28 02:58:00,455 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-28 02:58:00,459 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-28 02:58:00,467 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-28 02:58:00,473 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-28 02:58:00,475 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-28 02:58:00,476 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-28 02:58:00,481 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-28 02:58:00,483 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-28 02:58:00,483 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-28 02:58:00,484 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-28 02:58:00,486 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-28 02:58:00,487 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-28 02:58:00,488 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-28 02:58:00,489 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-28 02:58:00,491 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-28 02:58:00,492 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-28 02:58:00,494 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-28 02:58:00,494 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-28 02:58:00,495 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-28 02:58:00,495 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-28 02:58:00,495 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-28 02:58:00,497 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-28 02:58:00,498 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-28 02:58:00,501 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-11-28 02:58:00,537 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-28 02:58:00,538 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-28 02:58:00,539 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-28 02:58:00,539 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-28 02:58:00,540 INFO L138 SettingsManager]: * Use SBE=true [2020-11-28 02:58:00,540 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-28 02:58:00,540 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-28 02:58:00,540 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-28 02:58:00,541 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-28 02:58:00,541 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-28 02:58:00,541 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-28 02:58:00,541 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-28 02:58:00,542 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-28 02:58:00,542 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-28 02:58:00,542 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-28 02:58:00,542 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-28 02:58:00,543 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-28 02:58:00,543 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-28 02:58:00,543 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-28 02:58:00,543 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-28 02:58:00,544 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-28 02:58:00,544 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 02:58:00,544 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-28 02:58:00,544 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-28 02:58:00,544 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-28 02:58:00,545 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-28 02:58:00,545 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-28 02:58:00,545 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-28 02:58:00,545 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-28 02:58:00,546 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:/tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1b9a71645175fee79e6d6cd797db38ce6044ffb9 [2020-11-28 02:58:00,796 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 02:58:00,838 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 02:58:00,842 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 02:58:00,843 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 02:58:00,845 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 02:58:00,846 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer/../../sv-benchmarks/c/loops/invert_string-1.c [2020-11-28 02:58:00,922 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer/data/be7811119/a9c073b798614c72a31c49b1f26df20d/FLAG3e57eb61c [2020-11-28 02:58:01,493 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 02:58:01,494 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/sv-benchmarks/c/loops/invert_string-1.c [2020-11-28 02:58:01,506 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer/data/be7811119/a9c073b798614c72a31c49b1f26df20d/FLAG3e57eb61c [2020-11-28 02:58:01,873 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer/data/be7811119/a9c073b798614c72a31c49b1f26df20d [2020-11-28 02:58:01,876 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 02:58:01,879 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-28 02:58:01,898 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 02:58:01,899 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 02:58:01,902 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 02:58:01,904 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 02:58:01" (1/1) ... [2020-11-28 02:58:01,906 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3182a8ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 02:58:01, skipping insertion in model container [2020-11-28 02:58:01,907 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 02:58:01" (1/1) ... [2020-11-28 02:58:01,914 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 02:58:01,932 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 02:58:02,183 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 02:58:02,196 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 02:58:02,233 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 02:58:02,251 INFO L208 MainTranslator]: Completed translation [2020-11-28 02:58:02,253 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 02:58:02 WrapperNode [2020-11-28 02:58:02,253 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 02:58:02,254 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-28 02:58:02,255 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-28 02:58:02,255 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-28 02:58:02,263 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 02:58:02" (1/1) ... [2020-11-28 02:58:02,273 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 02:58:02" (1/1) ... [2020-11-28 02:58:02,300 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-28 02:58:02,301 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 02:58:02,302 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 02:58:02,303 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 02:58:02,311 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 02:58:02" (1/1) ... [2020-11-28 02:58:02,311 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 02:58:02" (1/1) ... [2020-11-28 02:58:02,323 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 02:58:02" (1/1) ... [2020-11-28 02:58:02,324 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 02:58:02" (1/1) ... [2020-11-28 02:58:02,336 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 02:58:02" (1/1) ... [2020-11-28 02:58:02,344 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 02:58:02" (1/1) ... [2020-11-28 02:58:02,346 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 02:58:02" (1/1) ... [2020-11-28 02:58:02,349 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 02:58:02,354 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 02:58:02,355 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 02:58:02,355 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 02:58:02,356 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 02:58:02" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 02:58:02,436 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-28 02:58:02,437 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-28 02:58:02,437 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-28 02:58:02,438 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 02:58:02,438 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 02:58:02,438 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-28 02:58:02,438 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-28 02:58:02,880 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 02:58:02,880 INFO L298 CfgBuilder]: Removed 11 assume(true) statements. [2020-11-28 02:58:02,882 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 02:58:02 BoogieIcfgContainer [2020-11-28 02:58:02,882 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 02:58:02,883 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-28 02:58:02,884 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-28 02:58:02,887 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-28 02:58:02,888 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 02:58:01" (1/3) ... [2020-11-28 02:58:02,889 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53b53136 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 02:58:02, skipping insertion in model container [2020-11-28 02:58:02,889 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 02:58:02" (2/3) ... [2020-11-28 02:58:02,889 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53b53136 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 02:58:02, skipping insertion in model container [2020-11-28 02:58:02,889 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 02:58:02" (3/3) ... [2020-11-28 02:58:02,891 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-11-28 02:58:02,902 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-28 02:58:02,906 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-28 02:58:02,919 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-28 02:58:02,943 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-28 02:58:02,943 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-28 02:58:02,943 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-28 02:58:02,943 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-28 02:58:02,943 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-28 02:58:02,944 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-28 02:58:02,944 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-28 02:58:02,944 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-28 02:58:02,957 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-11-28 02:58:02,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-11-28 02:58:02,962 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 02:58:02,963 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 02:58:02,963 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 02:58:02,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 02:58:02,969 INFO L82 PathProgramCache]: Analyzing trace with hash -56209308, now seen corresponding path program 1 times [2020-11-28 02:58:02,978 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 02:58:02,979 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [131136836] [2020-11-28 02:58:02,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 02:58:03,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 02:58:03,137 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 02:58:03,138 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [131136836] [2020-11-28 02:58:03,139 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 02:58:03,139 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-28 02:58:03,140 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [708459084] [2020-11-28 02:58:03,144 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-11-28 02:58:03,144 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 02:58:03,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-11-28 02:58:03,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-11-28 02:58:03,160 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-11-28 02:58:03,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 02:58:03,175 INFO L93 Difference]: Finished difference Result 38 states and 51 transitions. [2020-11-28 02:58:03,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-11-28 02:58:03,177 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2020-11-28 02:58:03,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 02:58:03,185 INFO L225 Difference]: With dead ends: 38 [2020-11-28 02:58:03,185 INFO L226 Difference]: Without dead ends: 16 [2020-11-28 02:58:03,188 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-11-28 02:58:03,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-11-28 02:58:03,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-11-28 02:58:03,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-11-28 02:58:03,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-11-28 02:58:03,220 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2020-11-28 02:58:03,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 02:58:03,221 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-11-28 02:58:03,221 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-11-28 02:58:03,222 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-11-28 02:58:03,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-11-28 02:58:03,222 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 02:58:03,222 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 02:58:03,223 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-28 02:58:03,223 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 02:58:03,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 02:58:03,224 INFO L82 PathProgramCache]: Analyzing trace with hash -411746854, now seen corresponding path program 1 times [2020-11-28 02:58:03,225 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 02:58:03,225 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1415971795] [2020-11-28 02:58:03,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 02:58:03,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 02:58:03,327 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 02:58:03,328 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1415971795] [2020-11-28 02:58:03,328 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 02:58:03,328 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-11-28 02:58:03,329 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113330503] [2020-11-28 02:58:03,330 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-28 02:58:03,330 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 02:58:03,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-28 02:58:03,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-11-28 02:58:03,332 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-11-28 02:58:03,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 02:58:03,416 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2020-11-28 02:58:03,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-28 02:58:03,416 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-11-28 02:58:03,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 02:58:03,417 INFO L225 Difference]: With dead ends: 34 [2020-11-28 02:58:03,417 INFO L226 Difference]: Without dead ends: 24 [2020-11-28 02:58:03,418 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-11-28 02:58:03,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-11-28 02:58:03,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 17. [2020-11-28 02:58:03,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-11-28 02:58:03,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-11-28 02:58:03,424 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2020-11-28 02:58:03,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 02:58:03,424 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-11-28 02:58:03,424 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-28 02:58:03,424 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-11-28 02:58:03,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-11-28 02:58:03,425 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 02:58:03,425 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 02:58:03,425 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-28 02:58:03,425 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 02:58:03,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 02:58:03,426 INFO L82 PathProgramCache]: Analyzing trace with hash 1790951096, now seen corresponding path program 1 times [2020-11-28 02:58:03,426 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 02:58:03,426 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1999337063] [2020-11-28 02:58:03,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 02:58:03,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 02:58:03,514 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-28 02:58:03,515 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1999337063] [2020-11-28 02:58:03,515 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 02:58:03,515 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-11-28 02:58:03,515 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676712015] [2020-11-28 02:58:03,516 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-28 02:58:03,516 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 02:58:03,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-28 02:58:03,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-28 02:58:03,517 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-11-28 02:58:03,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 02:58:03,574 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2020-11-28 02:58:03,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-28 02:58:03,574 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2020-11-28 02:58:03,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 02:58:03,575 INFO L225 Difference]: With dead ends: 25 [2020-11-28 02:58:03,575 INFO L226 Difference]: Without dead ends: 18 [2020-11-28 02:58:03,576 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-11-28 02:58:03,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-11-28 02:58:03,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-11-28 02:58:03,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-11-28 02:58:03,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-11-28 02:58:03,581 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2020-11-28 02:58:03,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 02:58:03,581 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-11-28 02:58:03,581 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-28 02:58:03,581 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-11-28 02:58:03,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-11-28 02:58:03,582 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 02:58:03,582 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 02:58:03,582 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-28 02:58:03,582 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 02:58:03,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 02:58:03,583 INFO L82 PathProgramCache]: Analyzing trace with hash 467501014, now seen corresponding path program 1 times [2020-11-28 02:58:03,583 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 02:58:03,584 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [78596408] [2020-11-28 02:58:03,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 02:58:03,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 02:58:04,239 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 02:58:04,239 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [78596408] [2020-11-28 02:58:04,239 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1168121781] [2020-11-28 02:58:04,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 02:58:04,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 02:58:04,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 25 conjunts are in the unsatisfiable core [2020-11-28 02:58:04,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 02:58:04,388 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-11-28 02:58:04,390 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 02:58:04,401 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 02:58:04,402 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-28 02:58:04,402 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:11 [2020-11-28 02:58:04,530 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2020-11-28 02:58:04,531 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 02:58:04,540 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 02:58:04,541 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-28 02:58:04,541 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:24 [2020-11-28 02:58:04,613 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 02:58:04,614 INFO L384 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 1 case distinctions, treesize of input 26 treesize of output 39 [2020-11-28 02:58:04,615 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 02:58:04,649 INFO L625 ElimStorePlain]: treesize reduction 22, result has 59.3 percent of original size [2020-11-28 02:58:04,650 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-28 02:58:04,650 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:36, output treesize:32 [2020-11-28 02:58:04,796 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:04,802 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:04,807 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:04,812 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:04,815 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:04,820 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:04,823 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:04,837 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:04,843 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:04,928 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 02:58:04,929 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 02:58:04,929 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 17 [2020-11-28 02:58:04,929 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658789612] [2020-11-28 02:58:04,930 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-11-28 02:58:04,930 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 02:58:04,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-11-28 02:58:04,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2020-11-28 02:58:04,932 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 17 states. [2020-11-28 02:58:05,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 02:58:05,836 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2020-11-28 02:58:05,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-11-28 02:58:05,837 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 15 [2020-11-28 02:58:05,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 02:58:05,838 INFO L225 Difference]: With dead ends: 41 [2020-11-28 02:58:05,838 INFO L226 Difference]: Without dead ends: 39 [2020-11-28 02:58:05,840 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=205, Invalid=551, Unknown=0, NotChecked=0, Total=756 [2020-11-28 02:58:05,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-11-28 02:58:05,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 27. [2020-11-28 02:58:05,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-11-28 02:58:05,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-11-28 02:58:05,848 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 15 [2020-11-28 02:58:05,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 02:58:05,848 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-11-28 02:58:05,848 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-11-28 02:58:05,848 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-11-28 02:58:05,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-11-28 02:58:05,849 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 02:58:05,850 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 02:58:06,074 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 02:58:06,074 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 02:58:06,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 02:58:06,075 INFO L82 PathProgramCache]: Analyzing trace with hash 35676596, now seen corresponding path program 2 times [2020-11-28 02:58:06,075 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 02:58:06,075 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1175085527] [2020-11-28 02:58:06,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 02:58:06,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 02:58:06,168 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 02:58:06,168 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1175085527] [2020-11-28 02:58:06,168 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1200974938] [2020-11-28 02:58:06,168 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 02:58:06,244 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-28 02:58:06,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 02:58:06,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-28 02:58:06,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 02:58:06,285 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 02:58:06,285 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 02:58:06,286 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2020-11-28 02:58:06,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105077449] [2020-11-28 02:58:06,286 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-28 02:58:06,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 02:58:06,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-28 02:58:06,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-11-28 02:58:06,288 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 6 states. [2020-11-28 02:58:06,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 02:58:06,426 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2020-11-28 02:58:06,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-28 02:58:06,427 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2020-11-28 02:58:06,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 02:58:06,428 INFO L225 Difference]: With dead ends: 45 [2020-11-28 02:58:06,428 INFO L226 Difference]: Without dead ends: 38 [2020-11-28 02:58:06,429 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-11-28 02:58:06,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-11-28 02:58:06,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 29. [2020-11-28 02:58:06,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-11-28 02:58:06,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-11-28 02:58:06,440 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 17 [2020-11-28 02:58:06,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 02:58:06,440 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-11-28 02:58:06,441 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-28 02:58:06,441 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-11-28 02:58:06,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-11-28 02:58:06,442 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 02:58:06,442 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 02:58:06,643 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 02:58:06,643 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 02:58:06,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 02:58:06,644 INFO L82 PathProgramCache]: Analyzing trace with hash 1570853842, now seen corresponding path program 3 times [2020-11-28 02:58:06,644 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 02:58:06,644 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [181152632] [2020-11-28 02:58:06,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 02:58:06,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 02:58:07,027 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 02:58:07,028 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [181152632] [2020-11-28 02:58:07,028 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1118707388] [2020-11-28 02:58:07,028 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 02:58:07,086 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-11-28 02:58:07,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 02:58:07,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 27 conjunts are in the unsatisfiable core [2020-11-28 02:58:07,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 02:58:07,101 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-11-28 02:58:07,103 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 02:58:07,108 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 02:58:07,108 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-28 02:58:07,108 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:12, output treesize:8 [2020-11-28 02:58:07,301 INFO L384 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 17 treesize of output 17 [2020-11-28 02:58:07,301 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 02:58:07,311 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 02:58:07,311 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-28 02:58:07,312 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:24 [2020-11-28 02:58:07,390 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:07,396 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:07,399 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:07,403 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:07,408 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:07,411 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:07,416 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:07,419 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:07,501 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 02:58:07,501 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 02:58:07,502 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2020-11-28 02:58:07,502 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343486925] [2020-11-28 02:58:07,502 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-11-28 02:58:07,503 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 02:58:07,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-11-28 02:58:07,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-11-28 02:58:07,504 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 22 states. [2020-11-28 02:58:08,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 02:58:08,701 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-11-28 02:58:08,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-11-28 02:58:08,702 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 19 [2020-11-28 02:58:08,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 02:58:08,703 INFO L225 Difference]: With dead ends: 59 [2020-11-28 02:58:08,703 INFO L226 Difference]: Without dead ends: 57 [2020-11-28 02:58:08,704 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=307, Invalid=1099, Unknown=0, NotChecked=0, Total=1406 [2020-11-28 02:58:08,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-11-28 02:58:08,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 34. [2020-11-28 02:58:08,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-11-28 02:58:08,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2020-11-28 02:58:08,712 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 19 [2020-11-28 02:58:08,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 02:58:08,713 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2020-11-28 02:58:08,713 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-11-28 02:58:08,713 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2020-11-28 02:58:08,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-11-28 02:58:08,714 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 02:58:08,714 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 02:58:08,925 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 02:58:08,926 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 02:58:08,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 02:58:08,927 INFO L82 PathProgramCache]: Analyzing trace with hash -78888342, now seen corresponding path program 1 times [2020-11-28 02:58:08,927 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 02:58:08,927 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [586645814] [2020-11-28 02:58:08,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 02:58:08,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 02:58:08,996 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-28 02:58:08,996 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [586645814] [2020-11-28 02:58:08,996 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [50049874] [2020-11-28 02:58:08,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 02:58:09,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 02:58:09,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-28 02:58:09,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 02:58:09,113 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-28 02:58:09,113 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 02:58:09,113 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-11-28 02:58:09,114 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773829390] [2020-11-28 02:58:09,114 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-28 02:58:09,114 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 02:58:09,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-28 02:58:09,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-11-28 02:58:09,115 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 10 states. [2020-11-28 02:58:09,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 02:58:09,232 INFO L93 Difference]: Finished difference Result 61 states and 67 transitions. [2020-11-28 02:58:09,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-28 02:58:09,233 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 19 [2020-11-28 02:58:09,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 02:58:09,234 INFO L225 Difference]: With dead ends: 61 [2020-11-28 02:58:09,234 INFO L226 Difference]: Without dead ends: 45 [2020-11-28 02:58:09,235 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2020-11-28 02:58:09,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-11-28 02:58:09,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 33. [2020-11-28 02:58:09,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-11-28 02:58:09,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-11-28 02:58:09,242 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 19 [2020-11-28 02:58:09,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 02:58:09,243 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-11-28 02:58:09,243 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-28 02:58:09,243 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-11-28 02:58:09,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-11-28 02:58:09,244 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 02:58:09,244 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 02:58:09,465 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 02:58:09,466 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 02:58:09,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 02:58:09,467 INFO L82 PathProgramCache]: Analyzing trace with hash -1044113744, now seen corresponding path program 4 times [2020-11-28 02:58:09,467 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 02:58:09,467 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1389228731] [2020-11-28 02:58:09,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 02:58:09,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 02:58:09,581 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 02:58:09,581 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1389228731] [2020-11-28 02:58:09,581 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1631515985] [2020-11-28 02:58:09,581 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 02:58:09,637 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-28 02:58:09,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 02:58:09,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 29 conjunts are in the unsatisfiable core [2020-11-28 02:58:09,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 02:58:09,690 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 02:58:09,691 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 19 [2020-11-28 02:58:09,694 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 02:58:09,714 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 02:58:09,715 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-28 02:58:09,715 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:17, output treesize:8 [2020-11-28 02:58:09,793 INFO L384 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 17 treesize of output 17 [2020-11-28 02:58:09,793 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 02:58:09,804 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 02:58:09,805 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-28 02:58:09,805 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:29 [2020-11-28 02:58:09,961 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:09,967 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:09,975 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:09,979 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:09,986 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:09,990 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:10,003 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:10,009 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:10,114 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-28 02:58:10,115 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 02:58:10,115 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11] total 16 [2020-11-28 02:58:10,115 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088389961] [2020-11-28 02:58:10,115 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-11-28 02:58:10,116 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 02:58:10,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-11-28 02:58:10,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2020-11-28 02:58:10,117 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 16 states. [2020-11-28 02:58:11,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 02:58:11,030 INFO L93 Difference]: Finished difference Result 79 states and 85 transitions. [2020-11-28 02:58:11,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-11-28 02:58:11,030 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 21 [2020-11-28 02:58:11,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 02:58:11,031 INFO L225 Difference]: With dead ends: 79 [2020-11-28 02:58:11,031 INFO L226 Difference]: Without dead ends: 69 [2020-11-28 02:58:11,033 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=283, Invalid=1199, Unknown=0, NotChecked=0, Total=1482 [2020-11-28 02:58:11,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-11-28 02:58:11,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 44. [2020-11-28 02:58:11,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-11-28 02:58:11,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 49 transitions. [2020-11-28 02:58:11,040 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 49 transitions. Word has length 21 [2020-11-28 02:58:11,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 02:58:11,041 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 49 transitions. [2020-11-28 02:58:11,041 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-11-28 02:58:11,041 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 49 transitions. [2020-11-28 02:58:11,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-11-28 02:58:11,042 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 02:58:11,042 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 02:58:11,269 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 02:58:11,270 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 02:58:11,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 02:58:11,270 INFO L82 PathProgramCache]: Analyzing trace with hash -1020544562, now seen corresponding path program 5 times [2020-11-28 02:58:11,270 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 02:58:11,271 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [497814779] [2020-11-28 02:58:11,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 02:58:11,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 02:58:11,617 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 02:58:11,617 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [497814779] [2020-11-28 02:58:11,617 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [68712575] [2020-11-28 02:58:11,617 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 02:58:11,659 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-11-28 02:58:11,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 02:58:11,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 38 conjunts are in the unsatisfiable core [2020-11-28 02:58:11,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 02:58:11,679 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-11-28 02:58:11,681 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 02:58:11,689 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 02:58:11,689 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-28 02:58:11,690 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:14 [2020-11-28 02:58:11,697 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-11-28 02:58:11,697 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 02:58:11,704 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 02:58:11,705 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-28 02:58:11,705 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:14 [2020-11-28 02:58:11,718 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-11-28 02:58:11,718 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 02:58:11,727 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 02:58:11,728 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-28 02:58:11,728 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:30, output treesize:17 [2020-11-28 02:58:11,738 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-11-28 02:58:11,738 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 02:58:11,748 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 02:58:11,749 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-28 02:58:11,749 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:33, output treesize:20 [2020-11-28 02:58:11,820 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2020-11-28 02:58:11,821 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 02:58:11,831 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 02:58:11,832 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-28 02:58:11,832 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:34, output treesize:30 [2020-11-28 02:58:11,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-28 02:58:11,876 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 31 [2020-11-28 02:58:11,877 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 02:58:11,906 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 02:58:11,906 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-28 02:58:11,906 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:50, output treesize:46 [2020-11-28 02:58:11,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-28 02:58:11,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-28 02:58:11,970 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 40 [2020-11-28 02:58:11,971 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 02:58:11,999 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 02:58:12,000 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-28 02:58:12,000 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:58, output treesize:54 [2020-11-28 02:58:12,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-28 02:58:12,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-28 02:58:12,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-28 02:58:12,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-28 02:58:12,067 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 52 [2020-11-28 02:58:12,068 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 02:58:12,083 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 02:58:12,084 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-28 02:58:12,084 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:68, output treesize:64 [2020-11-28 02:58:12,165 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 02:58:12,167 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-11-28 02:58:12,170 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-11-28 02:58:12,172 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-11-28 02:58:12,243 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 02:58:12,243 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 02:58:12,243 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 21 [2020-11-28 02:58:12,244 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674063884] [2020-11-28 02:58:12,244 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-11-28 02:58:12,244 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 02:58:12,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-11-28 02:58:12,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-11-28 02:58:12,245 INFO L87 Difference]: Start difference. First operand 44 states and 49 transitions. Second operand 21 states. [2020-11-28 02:58:13,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 02:58:13,674 INFO L93 Difference]: Finished difference Result 82 states and 89 transitions. [2020-11-28 02:58:13,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-11-28 02:58:13,674 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 23 [2020-11-28 02:58:13,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 02:58:13,675 INFO L225 Difference]: With dead ends: 82 [2020-11-28 02:58:13,675 INFO L226 Difference]: Without dead ends: 80 [2020-11-28 02:58:13,677 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=310, Invalid=1330, Unknown=0, NotChecked=0, Total=1640 [2020-11-28 02:58:13,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-11-28 02:58:13,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 52. [2020-11-28 02:58:13,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-11-28 02:58:13,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 58 transitions. [2020-11-28 02:58:13,687 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 58 transitions. Word has length 23 [2020-11-28 02:58:13,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 02:58:13,687 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 58 transitions. [2020-11-28 02:58:13,688 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-11-28 02:58:13,688 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 58 transitions. [2020-11-28 02:58:13,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-11-28 02:58:13,689 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 02:58:13,689 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 02:58:13,901 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 02:58:13,902 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 02:58:13,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 02:58:13,902 INFO L82 PathProgramCache]: Analyzing trace with hash 1322104934, now seen corresponding path program 2 times [2020-11-28 02:58:13,902 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 02:58:13,903 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113329255] [2020-11-28 02:58:13,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 02:58:13,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 02:58:13,934 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 02:58:13,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 02:58:13,976 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 02:58:14,002 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 02:58:14,002 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-28 02:58:14,002 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-11-28 02:58:14,038 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 02:58:14 BoogieIcfgContainer [2020-11-28 02:58:14,038 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-28 02:58:14,038 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 02:58:14,039 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 02:58:14,039 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 02:58:14,039 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 02:58:02" (3/4) ... [2020-11-28 02:58:14,041 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-28 02:58:14,089 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_4aa4a794-fab7-43c2-9d46-598cf58d70b3/bin/uautomizer/witness.graphml [2020-11-28 02:58:14,090 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 02:58:14,091 INFO L168 Benchmark]: Toolchain (without parser) took 12211.57 ms. Allocated memory was 98.6 MB in the beginning and 174.1 MB in the end (delta: 75.5 MB). Free memory was 70.8 MB in the beginning and 109.6 MB in the end (delta: -38.8 MB). Peak memory consumption was 36.1 MB. Max. memory is 16.1 GB. [2020-11-28 02:58:14,091 INFO L168 Benchmark]: CDTParser took 0.30 ms. Allocated memory is still 98.6 MB. Free memory is still 57.8 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 02:58:14,092 INFO L168 Benchmark]: CACSL2BoogieTranslator took 355.50 ms. Allocated memory is still 98.6 MB. Free memory was 70.6 MB in the beginning and 73.6 MB in the end (delta: -3.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-28 02:58:14,092 INFO L168 Benchmark]: Boogie Procedure Inliner took 45.56 ms. Allocated memory is still 98.6 MB. Free memory was 73.6 MB in the beginning and 72.1 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 02:58:14,092 INFO L168 Benchmark]: Boogie Preprocessor took 51.92 ms. Allocated memory is still 98.6 MB. Free memory was 72.1 MB in the beginning and 70.9 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 02:58:14,093 INFO L168 Benchmark]: RCFGBuilder took 527.94 ms. Allocated memory is still 98.6 MB. Free memory was 70.9 MB in the beginning and 56.7 MB in the end (delta: 14.2 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2020-11-28 02:58:14,093 INFO L168 Benchmark]: TraceAbstraction took 11154.60 ms. Allocated memory was 98.6 MB in the beginning and 174.1 MB in the end (delta: 75.5 MB). Free memory was 56.2 MB in the beginning and 112.7 MB in the end (delta: -56.5 MB). Peak memory consumption was 21.1 MB. Max. memory is 16.1 GB. [2020-11-28 02:58:14,094 INFO L168 Benchmark]: Witness Printer took 51.35 ms. Allocated memory is still 174.1 MB. Free memory was 112.7 MB in the beginning and 109.6 MB in the end (delta: 3.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-11-28 02:58:14,100 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30 ms. Allocated memory is still 98.6 MB. Free memory is still 57.8 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 355.50 ms. Allocated memory is still 98.6 MB. Free memory was 70.6 MB in the beginning and 73.6 MB in the end (delta: -3.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 45.56 ms. Allocated memory is still 98.6 MB. Free memory was 73.6 MB in the beginning and 72.1 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 51.92 ms. Allocated memory is still 98.6 MB. Free memory was 72.1 MB in the beginning and 70.9 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 527.94 ms. Allocated memory is still 98.6 MB. Free memory was 70.9 MB in the beginning and 56.7 MB in the end (delta: 14.2 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 11154.60 ms. Allocated memory was 98.6 MB in the beginning and 174.1 MB in the end (delta: 75.5 MB). Free memory was 56.2 MB in the beginning and 112.7 MB in the end (delta: -56.5 MB). Peak memory consumption was 21.1 MB. Max. memory is 16.1 GB. * Witness Printer took 51.35 ms. Allocated memory is still 174.1 MB. Free memory was 112.7 MB in the beginning and 109.6 MB in the end (delta: 3.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L16] int MAX = __VERIFIER_nondet_uint(); [L17] COND FALSE !(!(MAX > 0)) [L18] char str1[MAX], str2[MAX]; [L19] int cont, i, j; [L20] cont = 0 [L22] i=0 [L22] COND TRUE i= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- [L29] COND TRUE i >= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- [L29] COND FALSE !(i >= 0) [L34] j = MAX-1 [L35] i=0 [L35] COND TRUE i