./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_palindrome_ground.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/config/AutomizerReach.xml -i ../../sv-benchmarks/c/array-examples/standard_palindrome_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y --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 270a2842345dc5b188d8b64dce3436ccc5910bc1472a41053bc5c00e7f4ceeb6 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-13 18:20:14,773 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-13 18:20:14,776 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-13 18:20:14,828 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-13 18:20:14,829 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-13 18:20:14,830 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-13 18:20:14,833 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-13 18:20:14,836 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-13 18:20:14,839 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-13 18:20:14,841 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-13 18:20:14,843 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-13 18:20:14,845 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-13 18:20:14,846 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-13 18:20:14,848 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-13 18:20:14,850 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-13 18:20:14,853 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-13 18:20:14,854 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-13 18:20:14,865 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-13 18:20:14,868 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-13 18:20:14,872 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-13 18:20:14,874 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-13 18:20:14,878 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-13 18:20:14,881 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-13 18:20:14,884 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-13 18:20:14,888 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-13 18:20:14,889 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-13 18:20:14,889 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-13 18:20:14,891 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-13 18:20:14,892 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-13 18:20:14,893 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-13 18:20:14,894 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-13 18:20:14,895 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-13 18:20:14,897 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-13 18:20:14,898 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-13 18:20:14,900 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-13 18:20:14,901 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-13 18:20:14,902 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-13 18:20:14,902 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-13 18:20:14,903 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-13 18:20:14,905 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-13 18:20:14,906 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-13 18:20:14,911 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-13 18:20:14,968 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-13 18:20:14,969 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-13 18:20:14,969 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-13 18:20:14,970 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-13 18:20:14,971 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-13 18:20:14,971 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-13 18:20:14,972 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-13 18:20:14,972 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-13 18:20:14,973 INFO L138 SettingsManager]: * Use SBE=true [2021-11-13 18:20:14,973 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-13 18:20:14,973 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-13 18:20:14,974 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-13 18:20:14,974 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-13 18:20:14,974 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-13 18:20:14,975 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-13 18:20:14,975 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-13 18:20:14,975 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-13 18:20:14,976 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-13 18:20:14,983 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-13 18:20:14,984 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-13 18:20:14,984 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-13 18:20:14,984 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-13 18:20:14,985 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-13 18:20:14,985 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-13 18:20:14,986 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 18:20:14,987 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-13 18:20:14,987 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-13 18:20:14,987 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-13 18:20:14,988 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-13 18:20:14,991 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-13 18:20:14,991 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-13 18:20:14,992 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-13 18:20:14,992 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-13 18:20:14,992 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-13 18:20:14,993 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_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 270a2842345dc5b188d8b64dce3436ccc5910bc1472a41053bc5c00e7f4ceeb6 [2021-11-13 18:20:15,306 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-13 18:20:15,339 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-13 18:20:15,342 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-13 18:20:15,343 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-13 18:20:15,344 INFO L275 PluginConnector]: CDTParser initialized [2021-11-13 18:20:15,345 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/../../sv-benchmarks/c/array-examples/standard_palindrome_ground.i [2021-11-13 18:20:15,445 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/data/7a9ac677d/8325a8aab32b47b1956b5d9655e8d4b9/FLAG337b79627 [2021-11-13 18:20:16,117 INFO L306 CDTParser]: Found 1 translation units. [2021-11-13 18:20:16,118 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/sv-benchmarks/c/array-examples/standard_palindrome_ground.i [2021-11-13 18:20:16,125 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/data/7a9ac677d/8325a8aab32b47b1956b5d9655e8d4b9/FLAG337b79627 [2021-11-13 18:20:16,464 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/data/7a9ac677d/8325a8aab32b47b1956b5d9655e8d4b9 [2021-11-13 18:20:16,476 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-13 18:20:16,478 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-13 18:20:16,482 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-13 18:20:16,482 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-13 18:20:16,487 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-13 18:20:16,488 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 06:20:16" (1/1) ... [2021-11-13 18:20:16,490 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@14903966 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:20:16, skipping insertion in model container [2021-11-13 18:20:16,490 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 06:20:16" (1/1) ... [2021-11-13 18:20:16,499 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-13 18:20:16,520 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-13 18:20:16,708 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/sv-benchmarks/c/array-examples/standard_palindrome_ground.i[819,832] [2021-11-13 18:20:16,737 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 18:20:16,747 INFO L203 MainTranslator]: Completed pre-run [2021-11-13 18:20:16,762 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/sv-benchmarks/c/array-examples/standard_palindrome_ground.i[819,832] [2021-11-13 18:20:16,770 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 18:20:16,790 INFO L208 MainTranslator]: Completed translation [2021-11-13 18:20:16,791 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:20:16 WrapperNode [2021-11-13 18:20:16,791 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-13 18:20:16,792 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-13 18:20:16,792 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-13 18:20:16,793 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-13 18:20:16,800 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:20:16" (1/1) ... [2021-11-13 18:20:16,807 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:20:16" (1/1) ... [2021-11-13 18:20:16,831 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-13 18:20:16,832 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-13 18:20:16,832 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-13 18:20:16,833 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-13 18:20:16,844 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:20:16" (1/1) ... [2021-11-13 18:20:16,844 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:20:16" (1/1) ... [2021-11-13 18:20:16,846 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:20:16" (1/1) ... [2021-11-13 18:20:16,847 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:20:16" (1/1) ... [2021-11-13 18:20:16,853 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:20:16" (1/1) ... [2021-11-13 18:20:16,858 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:20:16" (1/1) ... [2021-11-13 18:20:16,859 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:20:16" (1/1) ... [2021-11-13 18:20:16,862 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-13 18:20:16,863 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-13 18:20:16,863 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-13 18:20:16,863 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-13 18:20:16,864 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:20:16" (1/1) ... [2021-11-13 18:20:16,885 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 18:20:16,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:20:16,921 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-13 18:20:16,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-13 18:20:16,986 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-13 18:20:16,986 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-13 18:20:16,986 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-13 18:20:16,987 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-13 18:20:16,987 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-13 18:20:16,988 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-13 18:20:16,988 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-13 18:20:17,195 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-13 18:20:17,195 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-13 18:20:17,197 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 06:20:17 BoogieIcfgContainer [2021-11-13 18:20:17,197 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-13 18:20:17,199 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-13 18:20:17,200 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-13 18:20:17,203 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-13 18:20:17,203 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.11 06:20:16" (1/3) ... [2021-11-13 18:20:17,205 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c32a151 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 06:20:17, skipping insertion in model container [2021-11-13 18:20:17,205 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:20:16" (2/3) ... [2021-11-13 18:20:17,206 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c32a151 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 06:20:17, skipping insertion in model container [2021-11-13 18:20:17,206 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 06:20:17" (3/3) ... [2021-11-13 18:20:17,208 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_palindrome_ground.i [2021-11-13 18:20:17,214 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-13 18:20:17,214 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-13 18:20:17,271 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-13 18:20:17,296 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-13 18:20:17,297 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-13 18:20:17,330 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:20:17,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-13 18:20:17,337 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:20:17,337 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:20:17,338 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:20:17,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:20:17,345 INFO L85 PathProgramCache]: Analyzing trace with hash -2016449835, now seen corresponding path program 1 times [2021-11-13 18:20:17,371 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:20:17,372 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [120295172] [2021-11-13 18:20:17,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:20:17,374 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:20:17,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:20:17,582 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:20:17,582 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:20:17,583 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [120295172] [2021-11-13 18:20:17,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [120295172] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:20:17,584 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:20:17,585 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-13 18:20:17,587 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430290673] [2021-11-13 18:20:17,588 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:20:17,604 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-13 18:20:17,604 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:20:17,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-13 18:20:17,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 18:20:17,654 INFO L87 Difference]: Start difference. First operand has 18 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:20:17,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:20:17,739 INFO L93 Difference]: Finished difference Result 36 states and 50 transitions. [2021-11-13 18:20:17,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-13 18:20:17,743 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-13 18:20:17,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:20:17,754 INFO L225 Difference]: With dead ends: 36 [2021-11-13 18:20:17,755 INFO L226 Difference]: Without dead ends: 18 [2021-11-13 18:20:17,759 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 18:20:17,767 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 2 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 44.07ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.50ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 56.61ms IncrementalHoareTripleChecker+Time [2021-11-13 18:20:17,769 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 28 Invalid, 12 Unknown, 0 Unchecked, 1.50ms Time], IncrementalHoareTripleChecker [2 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 56.61ms Time] [2021-11-13 18:20:17,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-13 18:20:17,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2021-11-13 18:20:17,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:20:17,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-11-13 18:20:17,840 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2021-11-13 18:20:17,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:20:17,841 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-11-13 18:20:17,842 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:20:17,844 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-11-13 18:20:17,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-13 18:20:17,854 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:20:17,855 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:20:17,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-13 18:20:17,856 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:20:17,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:20:17,863 INFO L85 PathProgramCache]: Analyzing trace with hash 2031054225, now seen corresponding path program 1 times [2021-11-13 18:20:17,863 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:20:17,863 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1808893673] [2021-11-13 18:20:17,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:20:17,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:20:17,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:20:17,944 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 18:20:17,945 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:20:17,945 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1808893673] [2021-11-13 18:20:17,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1808893673] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:20:17,946 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1150114152] [2021-11-13 18:20:17,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:20:17,947 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:20:17,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:20:17,950 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:20:17,980 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-13 18:20:18,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:20:18,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-13 18:20:18,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:20:18,133 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 18:20:18,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:20:18,220 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 18:20:18,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1150114152] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:20:18,222 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 18:20:18,223 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-13 18:20:18,224 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19584324] [2021-11-13 18:20:18,224 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 18:20:18,226 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-13 18:20:18,228 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:20:18,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-13 18:20:18,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-13 18:20:18,232 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:20:18,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:20:18,348 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2021-11-13 18:20:18,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-13 18:20:18,350 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-13 18:20:18,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:20:18,353 INFO L225 Difference]: With dead ends: 44 [2021-11-13 18:20:18,353 INFO L226 Difference]: Without dead ends: 33 [2021-11-13 18:20:18,354 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-13 18:20:18,358 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 26 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 63.19ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.29ms SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 83.17ms IncrementalHoareTripleChecker+Time [2021-11-13 18:20:18,359 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 34 Invalid, 35 Unknown, 0 Unchecked, 3.29ms Time], IncrementalHoareTripleChecker [13 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 83.17ms Time] [2021-11-13 18:20:18,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-13 18:20:18,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 24. [2021-11-13 18:20:18,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:20:18,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2021-11-13 18:20:18,382 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 13 [2021-11-13 18:20:18,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:20:18,383 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2021-11-13 18:20:18,383 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:20:18,384 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2021-11-13 18:20:18,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-13 18:20:18,391 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:20:18,391 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:20:18,437 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-13 18:20:18,608 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:20:18,608 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:20:18,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:20:18,609 INFO L85 PathProgramCache]: Analyzing trace with hash -1754797751, now seen corresponding path program 2 times [2021-11-13 18:20:18,609 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:20:18,610 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [274902479] [2021-11-13 18:20:18,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:20:18,610 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:20:18,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:20:18,842 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-13 18:20:18,843 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:20:18,843 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [274902479] [2021-11-13 18:20:18,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [274902479] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:20:18,844 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1449121696] [2021-11-13 18:20:18,848 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 18:20:18,848 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:20:18,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:20:18,856 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:20:18,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-13 18:20:18,931 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 18:20:18,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:20:18,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-13 18:20:18,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:20:19,053 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-13 18:20:19,054 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:20:19,236 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-13 18:20:19,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1449121696] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:20:19,239 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 18:20:19,239 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2021-11-13 18:20:19,239 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026499020] [2021-11-13 18:20:19,239 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 18:20:19,240 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-13 18:20:19,240 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:20:19,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-13 18:20:19,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2021-11-13 18:20:19,245 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:20:19,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:20:19,385 INFO L93 Difference]: Finished difference Result 64 states and 77 transitions. [2021-11-13 18:20:19,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-13 18:20:19,394 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-13 18:20:19,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:20:19,395 INFO L225 Difference]: With dead ends: 64 [2021-11-13 18:20:19,396 INFO L226 Difference]: Without dead ends: 51 [2021-11-13 18:20:19,396 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2021-11-13 18:20:19,398 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 78 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 69.84ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.56ms SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 90.02ms IncrementalHoareTripleChecker+Time [2021-11-13 18:20:19,399 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 35 Invalid, 73 Unknown, 0 Unchecked, 5.56ms Time], IncrementalHoareTripleChecker [28 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 90.02ms Time] [2021-11-13 18:20:19,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-13 18:20:19,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 42. [2021-11-13 18:20:19,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 41 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:20:19,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2021-11-13 18:20:19,413 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 21 [2021-11-13 18:20:19,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:20:19,415 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2021-11-13 18:20:19,415 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:20:19,415 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2021-11-13 18:20:19,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-13 18:20:19,417 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:20:19,417 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:20:19,466 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-13 18:20:19,644 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:20:19,645 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:20:19,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:20:19,646 INFO L85 PathProgramCache]: Analyzing trace with hash -707072841, now seen corresponding path program 3 times [2021-11-13 18:20:19,646 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:20:19,646 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [94617660] [2021-11-13 18:20:19,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:20:19,647 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:20:19,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:20:19,918 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-13 18:20:19,919 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:20:19,922 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [94617660] [2021-11-13 18:20:19,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [94617660] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:20:19,935 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [980511946] [2021-11-13 18:20:19,936 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 18:20:19,937 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:20:19,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:20:19,939 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:20:19,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-13 18:20:20,058 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-13 18:20:20,058 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:20:20,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-13 18:20:20,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:20:20,220 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-13 18:20:20,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:20:20,455 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-13 18:20:20,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [980511946] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:20:20,456 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 18:20:20,456 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8, 8] total 20 [2021-11-13 18:20:20,457 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779388036] [2021-11-13 18:20:20,457 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 18:20:20,458 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-13 18:20:20,458 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:20:20,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-13 18:20:20,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2021-11-13 18:20:20,462 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand has 20 states, 20 states have (on average 2.95) internal successors, (59), 20 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:20:20,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:20:20,675 INFO L93 Difference]: Finished difference Result 100 states and 122 transitions. [2021-11-13 18:20:20,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-13 18:20:20,677 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.95) internal successors, (59), 20 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-13 18:20:20,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:20:20,679 INFO L225 Difference]: With dead ends: 100 [2021-11-13 18:20:20,679 INFO L226 Difference]: Without dead ends: 81 [2021-11-13 18:20:20,680 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2021-11-13 18:20:20,681 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 58 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 110.27ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.90ms SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 150.49ms IncrementalHoareTripleChecker+Time [2021-11-13 18:20:20,682 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 52 Invalid, 150 Unknown, 0 Unchecked, 7.90ms Time], IncrementalHoareTripleChecker [65 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 150.49ms Time] [2021-11-13 18:20:20,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-13 18:20:20,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2021-11-13 18:20:20,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0379746835443038) internal successors, (82), 79 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:20:20,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2021-11-13 18:20:20,696 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 39 [2021-11-13 18:20:20,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:20:20,697 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2021-11-13 18:20:20,697 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.95) internal successors, (59), 20 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:20:20,697 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2021-11-13 18:20:20,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-13 18:20:20,701 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:20:20,701 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:20:20,745 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-13 18:20:20,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:20:20,916 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:20:20,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:20:20,916 INFO L85 PathProgramCache]: Analyzing trace with hash -775280303, now seen corresponding path program 4 times [2021-11-13 18:20:20,917 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:20:20,917 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [867171599] [2021-11-13 18:20:20,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:20:20,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:20:21,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:20:21,343 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-11-13 18:20:21,344 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:20:21,344 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [867171599] [2021-11-13 18:20:21,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [867171599] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:20:21,344 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1046618275] [2021-11-13 18:20:21,344 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 18:20:21,345 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:20:21,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:20:21,346 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:20:21,372 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-13 18:20:21,446 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 18:20:21,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:20:21,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-13 18:20:21,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:20:21,697 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-11-13 18:20:21,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:20:22,490 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-11-13 18:20:22,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1046618275] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:20:22,491 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 18:20:22,491 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2021-11-13 18:20:22,491 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275949785] [2021-11-13 18:20:22,492 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 18:20:22,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-13 18:20:22,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:20:22,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-13 18:20:22,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2021-11-13 18:20:22,495 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand has 39 states, 39 states have (on average 3.1025641025641026) internal successors, (121), 39 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:20:22,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:20:22,947 INFO L93 Difference]: Finished difference Result 200 states and 241 transitions. [2021-11-13 18:20:22,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-13 18:20:22,950 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 3.1025641025641026) internal successors, (121), 39 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2021-11-13 18:20:22,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:20:22,957 INFO L225 Difference]: With dead ends: 200 [2021-11-13 18:20:22,957 INFO L226 Difference]: Without dead ends: 157 [2021-11-13 18:20:22,959 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2021-11-13 18:20:22,961 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 189 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 178 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 248.76ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.17ms SdHoareTripleChecker+Time, 178 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 315.20ms IncrementalHoareTripleChecker+Time [2021-11-13 18:20:22,962 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [189 Valid, 28 Invalid, 329 Unknown, 0 Unchecked, 7.17ms Time], IncrementalHoareTripleChecker [178 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 315.20ms Time] [2021-11-13 18:20:22,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-11-13 18:20:23,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 156. [2021-11-13 18:20:23,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 155 states have (on average 1.0193548387096774) internal successors, (158), 155 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:20:23,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 158 transitions. [2021-11-13 18:20:23,009 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 158 transitions. Word has length 77 [2021-11-13 18:20:23,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:20:23,010 INFO L470 AbstractCegarLoop]: Abstraction has 156 states and 158 transitions. [2021-11-13 18:20:23,010 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 3.1025641025641026) internal successors, (121), 39 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 18:20:23,010 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 158 transitions. [2021-11-13 18:20:23,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-11-13 18:20:23,019 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:20:23,019 INFO L514 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:20:23,064 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-13 18:20:23,219 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:20:23,220 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:20:23,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:20:23,220 INFO L85 PathProgramCache]: Analyzing trace with hash 433379653, now seen corresponding path program 5 times [2021-11-13 18:20:23,220 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:20:23,221 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1578700251] [2021-11-13 18:20:23,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:20:23,221 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:20:23,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:20:24,138 INFO L134 CoverageAnalysis]: Checked inductivity of 2592 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 1296 trivial. 0 not checked. [2021-11-13 18:20:24,139 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:20:24,139 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1578700251] [2021-11-13 18:20:24,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1578700251] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:20:24,139 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [176345012] [2021-11-13 18:20:24,140 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-13 18:20:24,140 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:20:24,140 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:20:24,145 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:20:24,166 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_854a2b35-1fbb-49e0-994a-78d05c9208f4/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process