./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_5fb8efb7-e031-4a12-9b81-4c61922b79b1/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_5fb8efb7-e031-4a12-9b81-4c61922b79b1/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_5fb8efb7-e031-4a12-9b81-4c61922b79b1/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_5fb8efb7-e031-4a12-9b81-4c61922b79b1/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops/invert_string-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_5fb8efb7-e031-4a12-9b81-4c61922b79b1/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_5fb8efb7-e031-4a12-9b81-4c61922b79b1/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 [2020-11-29 20:15:16,889 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-29 20:15:16,893 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-29 20:15:16,958 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-29 20:15:16,959 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-29 20:15:16,972 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-29 20:15:16,977 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-29 20:15:16,982 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-29 20:15:16,986 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-29 20:15:16,995 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-29 20:15:16,996 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-29 20:15:16,999 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-29 20:15:16,999 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-29 20:15:17,004 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-29 20:15:17,006 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-29 20:15:17,009 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-29 20:15:17,010 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-29 20:15:17,012 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-29 20:15:17,019 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-29 20:15:17,028 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-29 20:15:17,031 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-29 20:15:17,033 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-29 20:15:17,036 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-29 20:15:17,037 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-29 20:15:17,044 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-29 20:15:17,044 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-29 20:15:17,045 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-29 20:15:17,048 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-29 20:15:17,049 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-29 20:15:17,050 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-29 20:15:17,051 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-29 20:15:17,052 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-29 20:15:17,055 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-29 20:15:17,057 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-29 20:15:17,058 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-29 20:15:17,059 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-29 20:15:17,060 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-29 20:15:17,060 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-29 20:15:17,061 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-29 20:15:17,062 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-29 20:15:17,063 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-29 20:15:17,066 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_5fb8efb7-e031-4a12-9b81-4c61922b79b1/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-11-29 20:15:17,114 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-29 20:15:17,115 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-29 20:15:17,117 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-29 20:15:17,118 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-29 20:15:17,118 INFO L138 SettingsManager]: * Use SBE=true [2020-11-29 20:15:17,118 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-29 20:15:17,119 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-29 20:15:17,119 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-29 20:15:17,119 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-29 20:15:17,120 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-29 20:15:17,121 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-29 20:15:17,122 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-29 20:15:17,122 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-29 20:15:17,122 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-29 20:15:17,123 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-29 20:15:17,123 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-29 20:15:17,123 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-29 20:15:17,124 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-29 20:15:17,124 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-29 20:15:17,124 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-29 20:15:17,124 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-29 20:15:17,125 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-29 20:15:17,125 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-29 20:15:17,125 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-29 20:15:17,126 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-29 20:15:17,126 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-29 20:15:17,126 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-29 20:15:17,127 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-29 20:15:17,127 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-29 20:15:17,127 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_5fb8efb7-e031-4a12-9b81-4c61922b79b1/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_5fb8efb7-e031-4a12-9b81-4c61922b79b1/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1b9a71645175fee79e6d6cd797db38ce6044ffb9 [2020-11-29 20:15:17,496 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-29 20:15:17,539 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-29 20:15:17,544 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-29 20:15:17,545 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-29 20:15:17,549 INFO L275 PluginConnector]: CDTParser initialized [2020-11-29 20:15:17,551 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_5fb8efb7-e031-4a12-9b81-4c61922b79b1/bin/uautomizer/../../sv-benchmarks/c/loops/invert_string-1.c [2020-11-29 20:15:17,673 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_5fb8efb7-e031-4a12-9b81-4c61922b79b1/bin/uautomizer/data/11d10b215/aec98da5304e427a87a39f037357b814/FLAGee6ecdf59 [2020-11-29 20:15:18,248 INFO L306 CDTParser]: Found 1 translation units. [2020-11-29 20:15:18,249 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_5fb8efb7-e031-4a12-9b81-4c61922b79b1/sv-benchmarks/c/loops/invert_string-1.c [2020-11-29 20:15:18,264 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_5fb8efb7-e031-4a12-9b81-4c61922b79b1/bin/uautomizer/data/11d10b215/aec98da5304e427a87a39f037357b814/FLAGee6ecdf59 [2020-11-29 20:15:18,583 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_5fb8efb7-e031-4a12-9b81-4c61922b79b1/bin/uautomizer/data/11d10b215/aec98da5304e427a87a39f037357b814 [2020-11-29 20:15:18,586 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-29 20:15:18,589 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-29 20:15:18,594 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-29 20:15:18,594 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-29 20:15:18,599 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-29 20:15:18,601 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.11 08:15:18" (1/1) ... [2020-11-29 20:15:18,604 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5f93370b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:15:18, skipping insertion in model container [2020-11-29 20:15:18,604 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.11 08:15:18" (1/1) ... [2020-11-29 20:15:18,617 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-29 20:15:18,636 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-29 20:15:18,899 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-29 20:15:18,919 INFO L203 MainTranslator]: Completed pre-run [2020-11-29 20:15:18,956 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-29 20:15:18,975 INFO L208 MainTranslator]: Completed translation [2020-11-29 20:15:18,977 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:15:18 WrapperNode [2020-11-29 20:15:18,977 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-29 20:15:18,978 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-29 20:15:18,978 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-29 20:15:18,979 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-29 20:15:18,986 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:15:18" (1/1) ... [2020-11-29 20:15:18,997 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:15:18" (1/1) ... [2020-11-29 20:15:19,026 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-29 20:15:19,028 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-29 20:15:19,028 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-29 20:15:19,029 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-29 20:15:19,039 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:15:18" (1/1) ... [2020-11-29 20:15:19,039 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:15:18" (1/1) ... [2020-11-29 20:15:19,053 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:15:18" (1/1) ... [2020-11-29 20:15:19,054 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:15:18" (1/1) ... [2020-11-29 20:15:19,060 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:15:18" (1/1) ... [2020-11-29 20:15:19,073 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:15:18" (1/1) ... [2020-11-29 20:15:19,081 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:15:18" (1/1) ... [2020-11-29 20:15:19,084 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-29 20:15:19,085 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-29 20:15:19,085 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-29 20:15:19,085 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-29 20:15:19,090 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:15:18" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5fb8efb7-e031-4a12-9b81-4c61922b79b1/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 [2020-11-29 20:15:19,174 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-29 20:15:19,174 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-29 20:15:19,175 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-29 20:15:19,176 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-29 20:15:19,176 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-29 20:15:19,177 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-29 20:15:19,177 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-29 20:15:19,725 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-29 20:15:19,726 INFO L298 CfgBuilder]: Removed 11 assume(true) statements. [2020-11-29 20:15:19,729 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 08:15:19 BoogieIcfgContainer [2020-11-29 20:15:19,729 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-29 20:15:19,732 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-29 20:15:19,733 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-29 20:15:19,737 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-29 20:15:19,738 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 29.11 08:15:18" (1/3) ... [2020-11-29 20:15:19,740 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6905c919 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.11 08:15:19, skipping insertion in model container [2020-11-29 20:15:19,740 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 08:15:18" (2/3) ... [2020-11-29 20:15:19,742 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6905c919 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.11 08:15:19, skipping insertion in model container [2020-11-29 20:15:19,742 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 08:15:19" (3/3) ... [2020-11-29 20:15:19,745 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-11-29 20:15:19,763 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-29 20:15:19,768 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-29 20:15:19,782 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-29 20:15:19,826 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-29 20:15:19,826 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-29 20:15:19,827 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-29 20:15:19,827 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-29 20:15:19,827 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-29 20:15:19,828 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-29 20:15:19,828 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-29 20:15:19,828 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-29 20:15:19,846 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-11-29 20:15:19,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-11-29 20:15:19,853 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 20:15:19,854 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 20:15:19,855 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 20:15:19,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 20:15:19,863 INFO L82 PathProgramCache]: Analyzing trace with hash -56209308, now seen corresponding path program 1 times [2020-11-29 20:15:19,872 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 20:15:19,872 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820634567] [2020-11-29 20:15:19,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 20:15:20,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 20:15:20,106 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 20:15:20,106 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1820634567] [2020-11-29 20:15:20,108 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 20:15:20,108 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-29 20:15:20,110 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174033054] [2020-11-29 20:15:20,114 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-11-29 20:15:20,115 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 20:15:20,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-11-29 20:15:20,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-11-29 20:15:20,136 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-11-29 20:15:20,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 20:15:20,156 INFO L93 Difference]: Finished difference Result 38 states and 51 transitions. [2020-11-29 20:15:20,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-11-29 20:15:20,157 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2020-11-29 20:15:20,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 20:15:20,168 INFO L225 Difference]: With dead ends: 38 [2020-11-29 20:15:20,168 INFO L226 Difference]: Without dead ends: 16 [2020-11-29 20:15:20,180 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 [2020-11-29 20:15:20,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-11-29 20:15:20,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-11-29 20:15:20,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-11-29 20:15:20,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-11-29 20:15:20,256 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2020-11-29 20:15:20,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 20:15:20,278 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-11-29 20:15:20,278 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-11-29 20:15:20,278 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-11-29 20:15:20,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-11-29 20:15:20,279 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 20:15:20,279 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 20:15:20,279 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-29 20:15:20,280 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 20:15:20,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 20:15:20,281 INFO L82 PathProgramCache]: Analyzing trace with hash -411746854, now seen corresponding path program 1 times [2020-11-29 20:15:20,281 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 20:15:20,281 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1045277937] [2020-11-29 20:15:20,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 20:15:20,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 20:15:20,473 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 20:15:20,473 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1045277937] [2020-11-29 20:15:20,474 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 20:15:20,474 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-11-29 20:15:20,474 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054559752] [2020-11-29 20:15:20,476 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-29 20:15:20,476 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 20:15:20,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-29 20:15:20,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-11-29 20:15:20,478 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-11-29 20:15:20,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 20:15:20,603 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2020-11-29 20:15:20,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-29 20:15:20,606 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-11-29 20:15:20,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 20:15:20,607 INFO L225 Difference]: With dead ends: 34 [2020-11-29 20:15:20,607 INFO L226 Difference]: Without dead ends: 24 [2020-11-29 20:15:20,608 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 [2020-11-29 20:15:20,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-11-29 20:15:20,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 17. [2020-11-29 20:15:20,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-11-29 20:15:20,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-11-29 20:15:20,616 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2020-11-29 20:15:20,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 20:15:20,617 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-11-29 20:15:20,617 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-29 20:15:20,618 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-11-29 20:15:20,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-11-29 20:15:20,620 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 20:15:20,620 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 20:15:20,621 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-29 20:15:20,622 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 20:15:20,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 20:15:20,623 INFO L82 PathProgramCache]: Analyzing trace with hash 1790951096, now seen corresponding path program 1 times [2020-11-29 20:15:20,623 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 20:15:20,624 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1487230535] [2020-11-29 20:15:20,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 20:15:20,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 20:15:20,718 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-29 20:15:20,718 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1487230535] [2020-11-29 20:15:20,718 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 20:15:20,719 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-11-29 20:15:20,719 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672140949] [2020-11-29 20:15:20,719 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-29 20:15:20,720 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 20:15:20,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-29 20:15:20,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-29 20:15:20,724 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-11-29 20:15:20,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 20:15:20,846 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2020-11-29 20:15:20,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-29 20:15:20,848 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2020-11-29 20:15:20,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 20:15:20,849 INFO L225 Difference]: With dead ends: 25 [2020-11-29 20:15:20,850 INFO L226 Difference]: Without dead ends: 18 [2020-11-29 20:15:20,850 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 [2020-11-29 20:15:20,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-11-29 20:15:20,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-11-29 20:15:20,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-11-29 20:15:20,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-11-29 20:15:20,863 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2020-11-29 20:15:20,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 20:15:20,864 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-11-29 20:15:20,865 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-29 20:15:20,865 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-11-29 20:15:20,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-11-29 20:15:20,867 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 20:15:20,867 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 20:15:20,867 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-29 20:15:20,867 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 20:15:20,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 20:15:20,869 INFO L82 PathProgramCache]: Analyzing trace with hash 467501014, now seen corresponding path program 1 times [2020-11-29 20:15:20,869 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 20:15:20,870 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1125002274] [2020-11-29 20:15:20,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 20:15:20,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 20:15:21,584 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 22 [2020-11-29 20:15:21,610 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 20:15:21,614 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1125002274] [2020-11-29 20:15:21,616 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1499373081] [2020-11-29 20:15:21,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5fb8efb7-e031-4a12-9b81-4c61922b79b1/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 [2020-11-29 20:15:21,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 20:15:21,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 25 conjunts are in the unsatisfiable core [2020-11-29 20:15:21,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 20:15:21,806 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 [2020-11-29 20:15:21,808 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 20:15:21,820 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 20:15:21,820 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-29 20:15:21,821 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:11 [2020-11-29 20:15:21,956 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 [2020-11-29 20:15:21,956 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 20:15:21,971 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 20:15:21,971 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 20:15:21,971 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:24 [2020-11-29 20:15:22,076 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 20:15:22,077 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 [2020-11-29 20:15:22,078 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 20:15:22,117 INFO L625 ElimStorePlain]: treesize reduction 22, result has 59.3 percent of original size [2020-11-29 20:15:22,118 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 20:15:22,118 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:36, output treesize:32 [2020-11-29 20:15:22,298 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:22,310 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:22,321 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:22,324 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:22,328 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:22,334 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:22,337 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:22,347 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:22,351 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:22,449 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 20:15:22,450 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 20:15:22,450 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 17 [2020-11-29 20:15:22,450 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777670909] [2020-11-29 20:15:22,451 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-11-29 20:15:22,451 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 20:15:22,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-11-29 20:15:22,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2020-11-29 20:15:22,453 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 17 states. [2020-11-29 20:15:23,084 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 31 [2020-11-29 20:15:23,423 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 28 [2020-11-29 20:15:23,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 20:15:23,635 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2020-11-29 20:15:23,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-11-29 20:15:23,636 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 15 [2020-11-29 20:15:23,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 20:15:23,637 INFO L225 Difference]: With dead ends: 41 [2020-11-29 20:15:23,637 INFO L226 Difference]: Without dead ends: 39 [2020-11-29 20:15:23,639 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=205, Invalid=551, Unknown=0, NotChecked=0, Total=756 [2020-11-29 20:15:23,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-11-29 20:15:23,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 27. [2020-11-29 20:15:23,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-11-29 20:15:23,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-11-29 20:15:23,646 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 15 [2020-11-29 20:15:23,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 20:15:23,647 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-11-29 20:15:23,647 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-11-29 20:15:23,647 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-11-29 20:15:23,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-11-29 20:15:23,661 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 20:15:23,661 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 20:15:23,889 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 20:15:23,890 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 20:15:23,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 20:15:23,891 INFO L82 PathProgramCache]: Analyzing trace with hash 35676596, now seen corresponding path program 2 times [2020-11-29 20:15:23,891 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 20:15:23,891 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [185762742] [2020-11-29 20:15:23,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 20:15:23,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 20:15:23,994 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 20:15:23,994 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [185762742] [2020-11-29 20:15:23,994 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [527618698] [2020-11-29 20:15:23,994 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5fb8efb7-e031-4a12-9b81-4c61922b79b1/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 [2020-11-29 20:15:24,065 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-29 20:15:24,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-29 20:15:24,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-29 20:15:24,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 20:15:24,097 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 20:15:24,098 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 20:15:24,098 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2020-11-29 20:15:24,098 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877849205] [2020-11-29 20:15:24,099 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-29 20:15:24,099 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 20:15:24,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-29 20:15:24,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-11-29 20:15:24,100 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 6 states. [2020-11-29 20:15:24,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 20:15:24,260 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2020-11-29 20:15:24,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-29 20:15:24,264 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2020-11-29 20:15:24,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 20:15:24,266 INFO L225 Difference]: With dead ends: 45 [2020-11-29 20:15:24,266 INFO L226 Difference]: Without dead ends: 38 [2020-11-29 20:15:24,267 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 [2020-11-29 20:15:24,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-11-29 20:15:24,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 29. [2020-11-29 20:15:24,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-11-29 20:15:24,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-11-29 20:15:24,282 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 17 [2020-11-29 20:15:24,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 20:15:24,282 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-11-29 20:15:24,282 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-29 20:15:24,283 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-11-29 20:15:24,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-11-29 20:15:24,284 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 20:15:24,284 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 20:15:24,490 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 20:15:24,491 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 20:15:24,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 20:15:24,491 INFO L82 PathProgramCache]: Analyzing trace with hash 1570853842, now seen corresponding path program 3 times [2020-11-29 20:15:24,491 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 20:15:24,492 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [970672612] [2020-11-29 20:15:24,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 20:15:24,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 20:15:25,039 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 20:15:25,040 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [970672612] [2020-11-29 20:15:25,040 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1703355597] [2020-11-29 20:15:25,040 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5fb8efb7-e031-4a12-9b81-4c61922b79b1/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 [2020-11-29 20:15:25,127 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-11-29 20:15:25,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-29 20:15:25,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 27 conjunts are in the unsatisfiable core [2020-11-29 20:15:25,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 20:15:25,149 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 [2020-11-29 20:15:25,152 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 20:15:25,158 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 20:15:25,159 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-29 20:15:25,159 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:12, output treesize:8 [2020-11-29 20:15:25,396 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 [2020-11-29 20:15:25,397 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 20:15:25,409 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 20:15:25,410 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 20:15:25,410 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:24 [2020-11-29 20:15:25,492 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:25,498 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:25,504 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:25,508 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:25,523 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:25,529 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:25,539 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:25,545 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:25,643 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 20:15:25,644 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 20:15:25,644 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2020-11-29 20:15:25,644 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1797981722] [2020-11-29 20:15:25,644 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-11-29 20:15:25,645 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 20:15:25,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-11-29 20:15:25,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-11-29 20:15:25,646 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 22 states. [2020-11-29 20:15:27,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 20:15:27,101 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-11-29 20:15:27,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-11-29 20:15:27,101 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 19 [2020-11-29 20:15:27,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 20:15:27,102 INFO L225 Difference]: With dead ends: 59 [2020-11-29 20:15:27,103 INFO L226 Difference]: Without dead ends: 57 [2020-11-29 20:15:27,104 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=307, Invalid=1099, Unknown=0, NotChecked=0, Total=1406 [2020-11-29 20:15:27,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-11-29 20:15:27,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 34. [2020-11-29 20:15:27,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-11-29 20:15:27,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2020-11-29 20:15:27,120 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 19 [2020-11-29 20:15:27,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 20:15:27,121 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2020-11-29 20:15:27,121 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-11-29 20:15:27,121 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2020-11-29 20:15:27,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-11-29 20:15:27,123 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 20:15:27,123 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 20:15:27,349 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 20:15:27,349 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 20:15:27,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 20:15:27,350 INFO L82 PathProgramCache]: Analyzing trace with hash -78888342, now seen corresponding path program 1 times [2020-11-29 20:15:27,350 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 20:15:27,350 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1966321647] [2020-11-29 20:15:27,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 20:15:27,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 20:15:27,423 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-29 20:15:27,424 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1966321647] [2020-11-29 20:15:27,424 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [245021653] [2020-11-29 20:15:27,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5fb8efb7-e031-4a12-9b81-4c61922b79b1/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 [2020-11-29 20:15:27,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 20:15:27,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-29 20:15:27,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 20:15:27,514 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-29 20:15:27,514 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 20:15:27,515 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-11-29 20:15:27,515 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166725602] [2020-11-29 20:15:27,515 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-29 20:15:27,515 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 20:15:27,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-29 20:15:27,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-11-29 20:15:27,516 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 10 states. [2020-11-29 20:15:27,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 20:15:27,670 INFO L93 Difference]: Finished difference Result 61 states and 67 transitions. [2020-11-29 20:15:27,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-29 20:15:27,671 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 19 [2020-11-29 20:15:27,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 20:15:27,672 INFO L225 Difference]: With dead ends: 61 [2020-11-29 20:15:27,672 INFO L226 Difference]: Without dead ends: 45 [2020-11-29 20:15:27,673 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 [2020-11-29 20:15:27,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-11-29 20:15:27,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 33. [2020-11-29 20:15:27,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-11-29 20:15:27,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-11-29 20:15:27,688 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 19 [2020-11-29 20:15:27,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 20:15:27,688 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-11-29 20:15:27,689 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-29 20:15:27,689 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-11-29 20:15:27,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-11-29 20:15:27,692 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 20:15:27,692 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 20:15:27,909 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 20:15:27,909 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 20:15:27,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 20:15:27,910 INFO L82 PathProgramCache]: Analyzing trace with hash -1044113744, now seen corresponding path program 4 times [2020-11-29 20:15:27,910 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 20:15:27,910 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837599637] [2020-11-29 20:15:27,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 20:15:27,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 20:15:28,044 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 20:15:28,045 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837599637] [2020-11-29 20:15:28,045 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1423250409] [2020-11-29 20:15:28,045 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5fb8efb7-e031-4a12-9b81-4c61922b79b1/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 [2020-11-29 20:15:28,094 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-29 20:15:28,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-29 20:15:28,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 29 conjunts are in the unsatisfiable core [2020-11-29 20:15:28,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 20:15:28,113 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 20:15:28,113 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 [2020-11-29 20:15:28,115 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 20:15:28,120 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 20:15:28,120 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-29 20:15:28,121 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:17, output treesize:8 [2020-11-29 20:15:28,210 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 [2020-11-29 20:15:28,211 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 20:15:28,222 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 20:15:28,222 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 20:15:28,223 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:29 [2020-11-29 20:15:28,376 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:28,387 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:28,392 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:28,397 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:28,406 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:28,409 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:28,415 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:28,417 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:28,475 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-29 20:15:28,476 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 20:15:28,476 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11] total 16 [2020-11-29 20:15:28,476 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959020302] [2020-11-29 20:15:28,476 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-11-29 20:15:28,476 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 20:15:28,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-11-29 20:15:28,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2020-11-29 20:15:28,478 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 16 states. [2020-11-29 20:15:29,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 20:15:29,647 INFO L93 Difference]: Finished difference Result 79 states and 85 transitions. [2020-11-29 20:15:29,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-11-29 20:15:29,647 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 21 [2020-11-29 20:15:29,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 20:15:29,649 INFO L225 Difference]: With dead ends: 79 [2020-11-29 20:15:29,650 INFO L226 Difference]: Without dead ends: 69 [2020-11-29 20:15:29,651 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=283, Invalid=1199, Unknown=0, NotChecked=0, Total=1482 [2020-11-29 20:15:29,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-11-29 20:15:29,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 44. [2020-11-29 20:15:29,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-11-29 20:15:29,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 49 transitions. [2020-11-29 20:15:29,662 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 49 transitions. Word has length 21 [2020-11-29 20:15:29,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 20:15:29,662 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 49 transitions. [2020-11-29 20:15:29,662 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-11-29 20:15:29,662 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 49 transitions. [2020-11-29 20:15:29,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-11-29 20:15:29,664 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 20:15:29,664 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 20:15:29,877 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 20:15:29,877 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 20:15:29,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 20:15:29,878 INFO L82 PathProgramCache]: Analyzing trace with hash -1020544562, now seen corresponding path program 5 times [2020-11-29 20:15:29,878 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 20:15:29,878 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [812011623] [2020-11-29 20:15:29,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 20:15:29,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 20:15:30,248 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 20:15:30,249 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [812011623] [2020-11-29 20:15:30,249 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2002811638] [2020-11-29 20:15:30,249 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5fb8efb7-e031-4a12-9b81-4c61922b79b1/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 [2020-11-29 20:15:30,318 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-11-29 20:15:30,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-29 20:15:30,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 38 conjunts are in the unsatisfiable core [2020-11-29 20:15:30,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 20:15:30,332 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 [2020-11-29 20:15:30,338 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 20:15:30,352 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 20:15:30,352 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-29 20:15:30,353 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:14 [2020-11-29 20:15:30,362 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 [2020-11-29 20:15:30,363 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 20:15:30,377 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 20:15:30,378 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 20:15:30,379 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:14 [2020-11-29 20:15:30,416 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 [2020-11-29 20:15:30,416 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 20:15:30,432 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 20:15:30,434 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 20:15:30,435 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:30, output treesize:17 [2020-11-29 20:15:30,447 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 [2020-11-29 20:15:30,448 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 20:15:30,474 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 20:15:30,475 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 20:15:30,476 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:33, output treesize:20 [2020-11-29 20:15:30,554 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 [2020-11-29 20:15:30,554 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 20:15:30,579 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 20:15:30,580 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 20:15:30,580 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:34, output treesize:30 [2020-11-29 20:15:30,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-29 20:15:30,656 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 [2020-11-29 20:15:30,657 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 20:15:30,698 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 20:15:30,698 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 20:15:30,699 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:50, output treesize:46 [2020-11-29 20:15:30,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-29 20:15:30,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-29 20:15:30,790 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 [2020-11-29 20:15:30,791 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 20:15:30,811 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 20:15:30,811 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 20:15:30,811 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:58, output treesize:54 [2020-11-29 20:15:30,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-29 20:15:30,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-29 20:15:30,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-29 20:15:30,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-29 20:15:30,903 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 [2020-11-29 20:15:30,904 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 20:15:30,925 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 20:15:30,926 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 20:15:30,926 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:68, output treesize:64 [2020-11-29 20:15:31,034 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 20:15:31,036 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-11-29 20:15:31,040 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-11-29 20:15:31,042 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-11-29 20:15:31,137 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 20:15:31,138 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 20:15:31,138 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 21 [2020-11-29 20:15:31,138 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123824479] [2020-11-29 20:15:31,139 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-11-29 20:15:31,139 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 20:15:31,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-11-29 20:15:31,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-11-29 20:15:31,141 INFO L87 Difference]: Start difference. First operand 44 states and 49 transitions. Second operand 21 states. [2020-11-29 20:15:32,172 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 40 [2020-11-29 20:15:32,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 20:15:32,983 INFO L93 Difference]: Finished difference Result 82 states and 89 transitions. [2020-11-29 20:15:32,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-11-29 20:15:32,984 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 23 [2020-11-29 20:15:32,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 20:15:32,985 INFO L225 Difference]: With dead ends: 82 [2020-11-29 20:15:32,985 INFO L226 Difference]: Without dead ends: 80 [2020-11-29 20:15:32,986 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=310, Invalid=1330, Unknown=0, NotChecked=0, Total=1640 [2020-11-29 20:15:32,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-11-29 20:15:33,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 52. [2020-11-29 20:15:33,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-11-29 20:15:33,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 58 transitions. [2020-11-29 20:15:33,003 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 58 transitions. Word has length 23 [2020-11-29 20:15:33,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 20:15:33,004 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 58 transitions. [2020-11-29 20:15:33,004 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-11-29 20:15:33,004 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 58 transitions. [2020-11-29 20:15:33,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-11-29 20:15:33,005 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 20:15:33,005 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 20:15:33,217 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 20:15:33,217 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-29 20:15:33,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 20:15:33,218 INFO L82 PathProgramCache]: Analyzing trace with hash 1322104934, now seen corresponding path program 2 times [2020-11-29 20:15:33,218 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 20:15:33,218 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734307169] [2020-11-29 20:15:33,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 20:15:33,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 20:15:33,247 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 20:15:33,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 20:15:33,269 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 20:15:33,293 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 20:15:33,294 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-29 20:15:33,294 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-11-29 20:15:33,353 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 29.11 08:15:33 BoogieIcfgContainer [2020-11-29 20:15:33,355 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-29 20:15:33,356 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-29 20:15:33,356 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-29 20:15:33,356 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-29 20:15:33,357 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 08:15:19" (3/4) ... [2020-11-29 20:15:33,358 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-29 20:15:33,425 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_5fb8efb7-e031-4a12-9b81-4c61922b79b1/bin/uautomizer/witness.graphml [2020-11-29 20:15:33,426 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-29 20:15:33,427 INFO L168 Benchmark]: Toolchain (without parser) took 14837.94 ms. Allocated memory was 83.9 MB in the beginning and 174.1 MB in the end (delta: 90.2 MB). Free memory was 53.0 MB in the beginning and 91.8 MB in the end (delta: -38.8 MB). Peak memory consumption was 52.7 MB. Max. memory is 16.1 GB. [2020-11-29 20:15:33,427 INFO L168 Benchmark]: CDTParser took 0.37 ms. Allocated memory is still 83.9 MB. Free memory was 43.4 MB in the beginning and 43.3 MB in the end (delta: 34.9 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-29 20:15:33,428 INFO L168 Benchmark]: CACSL2BoogieTranslator took 383.49 ms. Allocated memory is still 83.9 MB. Free memory was 52.8 MB in the beginning and 62.3 MB in the end (delta: -9.5 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-29 20:15:33,428 INFO L168 Benchmark]: Boogie Procedure Inliner took 48.19 ms. Allocated memory is still 83.9 MB. Free memory was 62.3 MB in the beginning and 60.6 MB in the end (delta: 1.7 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-29 20:15:33,429 INFO L168 Benchmark]: Boogie Preprocessor took 56.22 ms. Allocated memory is still 83.9 MB. Free memory was 60.6 MB in the beginning and 59.8 MB in the end (delta: 877.9 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-29 20:15:33,430 INFO L168 Benchmark]: RCFGBuilder took 644.86 ms. Allocated memory is still 83.9 MB. Free memory was 59.4 MB in the beginning and 45.3 MB in the end (delta: 14.1 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.1 GB. [2020-11-29 20:15:33,430 INFO L168 Benchmark]: TraceAbstraction took 13623.03 ms. Allocated memory was 83.9 MB in the beginning and 174.1 MB in the end (delta: 90.2 MB). Free memory was 44.9 MB in the beginning and 93.9 MB in the end (delta: -49.0 MB). Peak memory consumption was 43.1 MB. Max. memory is 16.1 GB. [2020-11-29 20:15:33,431 INFO L168 Benchmark]: Witness Printer took 70.00 ms. Allocated memory is still 174.1 MB. Free memory was 93.9 MB in the beginning and 91.8 MB in the end (delta: 2.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-11-29 20:15:33,433 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.37 ms. Allocated memory is still 83.9 MB. Free memory was 43.4 MB in the beginning and 43.3 MB in the end (delta: 34.9 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 383.49 ms. Allocated memory is still 83.9 MB. Free memory was 52.8 MB in the beginning and 62.3 MB in the end (delta: -9.5 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 48.19 ms. Allocated memory is still 83.9 MB. Free memory was 62.3 MB in the beginning and 60.6 MB in the end (delta: 1.7 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 56.22 ms. Allocated memory is still 83.9 MB. Free memory was 60.6 MB in the beginning and 59.8 MB in the end (delta: 877.9 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 644.86 ms. Allocated memory is still 83.9 MB. Free memory was 59.4 MB in the beginning and 45.3 MB in the end (delta: 14.1 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.1 GB. * TraceAbstraction took 13623.03 ms. Allocated memory was 83.9 MB in the beginning and 174.1 MB in the end (delta: 90.2 MB). Free memory was 44.9 MB in the beginning and 93.9 MB in the end (delta: -49.0 MB). Peak memory consumption was 43.1 MB. Max. memory is 16.1 GB. * Witness Printer took 70.00 ms. Allocated memory is still 174.1 MB. Free memory was 93.9 MB in the beginning and 91.8 MB in the end (delta: 2.1 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