./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_copy4_ground-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/config/AutomizerReach.xml -i ../../sv-benchmarks/c/array-examples/standard_copy4_ground-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa --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 4a66002bd28db929747d199b9986ccd34ccce90ecf5386b8e2342838dba13a02 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-12-06 20:56:45,418 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-06 20:56:45,420 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-06 20:56:45,441 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-06 20:56:45,442 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-06 20:56:45,443 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-06 20:56:45,444 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-06 20:56:45,446 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-06 20:56:45,447 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-06 20:56:45,448 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-06 20:56:45,449 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-06 20:56:45,450 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-06 20:56:45,450 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-06 20:56:45,451 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-06 20:56:45,452 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-06 20:56:45,453 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-06 20:56:45,454 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-06 20:56:45,455 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-06 20:56:45,456 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-06 20:56:45,458 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-06 20:56:45,459 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-06 20:56:45,461 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-06 20:56:45,462 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-06 20:56:45,463 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-06 20:56:45,466 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-06 20:56:45,467 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-06 20:56:45,467 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-06 20:56:45,468 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-06 20:56:45,469 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-06 20:56:45,470 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-06 20:56:45,470 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-06 20:56:45,471 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-06 20:56:45,472 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-06 20:56:45,472 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-06 20:56:45,473 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-06 20:56:45,474 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-06 20:56:45,474 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-06 20:56:45,474 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-06 20:56:45,475 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-06 20:56:45,475 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-06 20:56:45,476 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-06 20:56:45,477 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-06 20:56:45,499 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-06 20:56:45,499 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-06 20:56:45,500 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-06 20:56:45,500 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-06 20:56:45,501 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-06 20:56:45,501 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-06 20:56:45,501 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-06 20:56:45,502 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-06 20:56:45,502 INFO L138 SettingsManager]: * Use SBE=true [2021-12-06 20:56:45,502 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-06 20:56:45,502 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-06 20:56:45,502 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-06 20:56:45,503 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-06 20:56:45,503 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-06 20:56:45,503 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-06 20:56:45,503 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-06 20:56:45,503 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-06 20:56:45,503 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-06 20:56:45,504 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-06 20:56:45,504 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-06 20:56:45,504 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-06 20:56:45,504 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-06 20:56:45,504 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-06 20:56:45,505 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-06 20:56:45,505 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-06 20:56:45,505 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-06 20:56:45,505 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-06 20:56:45,505 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-06 20:56:45,505 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-06 20:56:45,506 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-06 20:56:45,506 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-06 20:56:45,506 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-06 20:56:45,506 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-06 20:56:45,506 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-06 20:56:45,507 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_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4a66002bd28db929747d199b9986ccd34ccce90ecf5386b8e2342838dba13a02 [2021-12-06 20:56:45,709 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-06 20:56:45,726 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-06 20:56:45,728 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-06 20:56:45,729 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-06 20:56:45,729 INFO L275 PluginConnector]: CDTParser initialized [2021-12-06 20:56:45,730 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/../../sv-benchmarks/c/array-examples/standard_copy4_ground-2.i [2021-12-06 20:56:45,777 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/data/4cacc66af/d6a36218e0e2467a8ba82918e3808646/FLAG7b0f076d6 [2021-12-06 20:56:46,146 INFO L306 CDTParser]: Found 1 translation units. [2021-12-06 20:56:46,146 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/sv-benchmarks/c/array-examples/standard_copy4_ground-2.i [2021-12-06 20:56:46,151 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/data/4cacc66af/d6a36218e0e2467a8ba82918e3808646/FLAG7b0f076d6 [2021-12-06 20:56:46,161 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/data/4cacc66af/d6a36218e0e2467a8ba82918e3808646 [2021-12-06 20:56:46,163 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-06 20:56:46,164 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-06 20:56:46,166 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-06 20:56:46,166 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-06 20:56:46,168 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-06 20:56:46,169 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.12 08:56:46" (1/1) ... [2021-12-06 20:56:46,170 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@57b920ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 08:56:46, skipping insertion in model container [2021-12-06 20:56:46,170 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.12 08:56:46" (1/1) ... [2021-12-06 20:56:46,175 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-06 20:56:46,186 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-06 20:56:46,292 WARN L230 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_3bf50cbb-9190-4607-9999-e5ec9e173e8e/sv-benchmarks/c/array-examples/standard_copy4_ground-2.i[816,829] [2021-12-06 20:56:46,304 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-06 20:56:46,310 INFO L203 MainTranslator]: Completed pre-run [2021-12-06 20:56:46,319 WARN L230 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_3bf50cbb-9190-4607-9999-e5ec9e173e8e/sv-benchmarks/c/array-examples/standard_copy4_ground-2.i[816,829] [2021-12-06 20:56:46,326 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-06 20:56:46,337 INFO L208 MainTranslator]: Completed translation [2021-12-06 20:56:46,337 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 08:56:46 WrapperNode [2021-12-06 20:56:46,337 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-06 20:56:46,338 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-06 20:56:46,338 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-06 20:56:46,338 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-06 20:56:46,344 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 08:56:46" (1/1) ... [2021-12-06 20:56:46,349 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 08:56:46" (1/1) ... [2021-12-06 20:56:46,364 INFO L137 Inliner]: procedures = 16, calls = 34, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 115 [2021-12-06 20:56:46,365 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-06 20:56:46,365 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-06 20:56:46,365 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-06 20:56:46,365 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-06 20:56:46,371 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 08:56:46" (1/1) ... [2021-12-06 20:56:46,371 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 08:56:46" (1/1) ... [2021-12-06 20:56:46,373 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 08:56:46" (1/1) ... [2021-12-06 20:56:46,373 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 08:56:46" (1/1) ... [2021-12-06 20:56:46,378 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 08:56:46" (1/1) ... [2021-12-06 20:56:46,381 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 08:56:46" (1/1) ... [2021-12-06 20:56:46,382 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 08:56:46" (1/1) ... [2021-12-06 20:56:46,384 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-06 20:56:46,384 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-06 20:56:46,384 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-06 20:56:46,385 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-06 20:56:46,385 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 08:56:46" (1/1) ... [2021-12-06 20:56:46,392 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-06 20:56:46,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 20:56:46,410 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-06 20:56:46,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-06 20:56:46,448 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-06 20:56:46,448 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-06 20:56:46,448 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-06 20:56:46,448 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-06 20:56:46,448 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-06 20:56:46,449 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-06 20:56:46,449 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-06 20:56:46,449 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-06 20:56:46,507 INFO L236 CfgBuilder]: Building ICFG [2021-12-06 20:56:46,508 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-06 20:56:46,624 INFO L277 CfgBuilder]: Performing block encoding [2021-12-06 20:56:46,629 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-06 20:56:46,629 INFO L301 CfgBuilder]: Removed 6 assume(true) statements. [2021-12-06 20:56:46,630 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.12 08:56:46 BoogieIcfgContainer [2021-12-06 20:56:46,631 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-06 20:56:46,632 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-06 20:56:46,632 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-06 20:56:46,635 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-06 20:56:46,635 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.12 08:56:46" (1/3) ... [2021-12-06 20:56:46,636 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54dc9801 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.12 08:56:46, skipping insertion in model container [2021-12-06 20:56:46,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 08:56:46" (2/3) ... [2021-12-06 20:56:46,636 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54dc9801 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.12 08:56:46, skipping insertion in model container [2021-12-06 20:56:46,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.12 08:56:46" (3/3) ... [2021-12-06 20:56:46,637 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_copy4_ground-2.i [2021-12-06 20:56:46,641 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-06 20:56:46,641 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-06 20:56:46,675 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-06 20:56:46,680 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 [2021-12-06 20:56:46,680 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-06 20:56:46,690 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 25 states have (on average 1.56) internal successors, (39), 26 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 20:56:46,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-12-06 20:56:46,695 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 20:56:46,695 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 20:56:46,695 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 20:56:46,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 20:56:46,700 INFO L85 PathProgramCache]: Analyzing trace with hash 1890477095, now seen corresponding path program 1 times [2021-12-06 20:56:46,706 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 20:56:46,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1581214698] [2021-12-06 20:56:46,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 20:56:46,708 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 20:56:46,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 20:56:46,863 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-06 20:56:46,864 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 20:56:46,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1581214698] [2021-12-06 20:56:46,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1581214698] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 20:56:46,865 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-06 20:56:46,865 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-06 20:56:46,866 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098099004] [2021-12-06 20:56:46,867 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 20:56:46,870 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-06 20:56:46,870 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 20:56:46,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-06 20:56:46,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-06 20:56:46,893 INFO L87 Difference]: Start difference. First operand has 27 states, 25 states have (on average 1.56) internal successors, (39), 26 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 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) [2021-12-06 20:56:46,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 20:56:46,914 INFO L93 Difference]: Finished difference Result 52 states and 76 transitions. [2021-12-06 20:56:46,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-06 20:56:46,916 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 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 15 [2021-12-06 20:56:46,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 20:56:46,921 INFO L225 Difference]: With dead ends: 52 [2021-12-06 20:56:46,922 INFO L226 Difference]: Without dead ends: 25 [2021-12-06 20:56:46,924 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 [2021-12-06 20:56:46,927 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 1 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-06 20:56:46,928 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 58 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 20:56:46,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-12-06 20:56:46,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2021-12-06 20:56:46,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 23 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 20:56:46,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2021-12-06 20:56:46,952 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 15 [2021-12-06 20:56:46,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 20:56:46,952 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2021-12-06 20:56:46,952 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 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) [2021-12-06 20:56:46,952 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2021-12-06 20:56:46,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-06 20:56:46,953 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 20:56:46,953 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 20:56:46,953 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-06 20:56:46,953 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 20:56:46,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 20:56:46,954 INFO L85 PathProgramCache]: Analyzing trace with hash 1812867813, now seen corresponding path program 1 times [2021-12-06 20:56:46,954 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 20:56:46,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504101747] [2021-12-06 20:56:46,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 20:56:46,955 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 20:56:46,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 20:56:47,012 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-06 20:56:47,012 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 20:56:47,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504101747] [2021-12-06 20:56:47,013 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [504101747] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 20:56:47,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1667791753] [2021-12-06 20:56:47,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 20:56:47,013 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 20:56:47,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 20:56:47,014 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 20:56:47,015 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-06 20:56:47,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 20:56:47,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 2 conjunts are in the unsatisfiable core [2021-12-06 20:56:47,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 20:56:47,119 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-06 20:56:47,119 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-06 20:56:47,120 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1667791753] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 20:56:47,120 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-06 20:56:47,120 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2021-12-06 20:56:47,121 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569679730] [2021-12-06 20:56:47,121 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 20:56:47,122 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-06 20:56:47,122 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 20:56:47,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-06 20:56:47,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-06 20:56:47,123 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 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) [2021-12-06 20:56:47,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 20:56:47,159 INFO L93 Difference]: Finished difference Result 48 states and 60 transitions. [2021-12-06 20:56:47,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-06 20:56:47,160 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 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 17 [2021-12-06 20:56:47,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 20:56:47,161 INFO L225 Difference]: With dead ends: 48 [2021-12-06 20:56:47,161 INFO L226 Difference]: Without dead ends: 32 [2021-12-06 20:56:47,162 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-06 20:56:47,163 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 4 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-06 20:56:47,164 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 31 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 20:56:47,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-12-06 20:56:47,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 28. [2021-12-06 20:56:47,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 27 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 20:56:47,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2021-12-06 20:56:47,170 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 17 [2021-12-06 20:56:47,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 20:56:47,170 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2021-12-06 20:56:47,171 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 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) [2021-12-06 20:56:47,171 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2021-12-06 20:56:47,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-06 20:56:47,172 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 20:56:47,172 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 20:56:47,193 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-06 20:56:47,373 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-12-06 20:56:47,375 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 20:56:47,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 20:56:47,377 INFO L85 PathProgramCache]: Analyzing trace with hash -2029995939, now seen corresponding path program 1 times [2021-12-06 20:56:47,378 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 20:56:47,378 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [480950206] [2021-12-06 20:56:47,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 20:56:47,378 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 20:56:47,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 20:56:47,519 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-06 20:56:47,519 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 20:56:47,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [480950206] [2021-12-06 20:56:47,520 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [480950206] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 20:56:47,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [87062953] [2021-12-06 20:56:47,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 20:56:47,520 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 20:56:47,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 20:56:47,522 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 20:56:47,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-06 20:56:47,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 20:56:47,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-06 20:56:47,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 20:56:47,636 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-06 20:56:47,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 20:56:47,676 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-06 20:56:47,676 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [87062953] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 20:56:47,676 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 20:56:47,676 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-12-06 20:56:47,676 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500283696] [2021-12-06 20:56:47,677 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 20:56:47,677 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-06 20:56:47,677 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 20:56:47,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-06 20:56:47,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-12-06 20:56:47,678 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 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) [2021-12-06 20:56:47,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 20:56:47,698 INFO L93 Difference]: Finished difference Result 57 states and 69 transitions. [2021-12-06 20:56:47,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-06 20:56:47,698 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 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 25 [2021-12-06 20:56:47,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 20:56:47,699 INFO L225 Difference]: With dead ends: 57 [2021-12-06 20:56:47,699 INFO L226 Difference]: Without dead ends: 34 [2021-12-06 20:56:47,699 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-12-06 20:56:47,700 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 4 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-06 20:56:47,701 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 74 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 20:56:47,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-12-06 20:56:47,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-12-06 20:56:47,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 33 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 20:56:47,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2021-12-06 20:56:47,705 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 25 [2021-12-06 20:56:47,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 20:56:47,705 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2021-12-06 20:56:47,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 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) [2021-12-06 20:56:47,706 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2021-12-06 20:56:47,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-06 20:56:47,706 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 20:56:47,706 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 20:56:47,729 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-06 20:56:47,907 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 20:56:47,909 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 20:56:47,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 20:56:47,911 INFO L85 PathProgramCache]: Analyzing trace with hash 1256809879, now seen corresponding path program 2 times [2021-12-06 20:56:47,911 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 20:56:47,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [487964434] [2021-12-06 20:56:47,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 20:56:47,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 20:56:48,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 20:56:48,079 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-12-06 20:56:48,080 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 20:56:48,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [487964434] [2021-12-06 20:56:48,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [487964434] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 20:56:48,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1322199027] [2021-12-06 20:56:48,080 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-06 20:56:48,081 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 20:56:48,081 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 20:56:48,082 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 20:56:48,082 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-06 20:56:48,138 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-06 20:56:48,138 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 20:56:48,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-06 20:56:48,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 20:56:48,197 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-06 20:56:48,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 20:56:48,271 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-06 20:56:48,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1322199027] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 20:56:48,272 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 20:56:48,272 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 7, 7] total 14 [2021-12-06 20:56:48,272 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850025508] [2021-12-06 20:56:48,272 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 20:56:48,273 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-06 20:56:48,273 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 20:56:48,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-06 20:56:48,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-12-06 20:56:48,274 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand has 14 states, 14 states have (on average 3.5) internal successors, (49), 14 states have internal predecessors, (49), 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) [2021-12-06 20:56:48,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 20:56:48,333 INFO L93 Difference]: Finished difference Result 81 states and 100 transitions. [2021-12-06 20:56:48,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-06 20:56:48,334 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.5) internal successors, (49), 14 states have internal predecessors, (49), 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 31 [2021-12-06 20:56:48,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 20:56:48,334 INFO L225 Difference]: With dead ends: 81 [2021-12-06 20:56:48,334 INFO L226 Difference]: Without dead ends: 58 [2021-12-06 20:56:48,335 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-12-06 20:56:48,336 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 21 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-06 20:56:48,336 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 75 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 20:56:48,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-12-06 20:56:48,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 54. [2021-12-06 20:56:48,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.1132075471698113) internal successors, (59), 53 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) [2021-12-06 20:56:48,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2021-12-06 20:56:48,341 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 31 [2021-12-06 20:56:48,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 20:56:48,342 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2021-12-06 20:56:48,342 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.5) internal successors, (49), 14 states have internal predecessors, (49), 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) [2021-12-06 20:56:48,342 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2021-12-06 20:56:48,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-12-06 20:56:48,343 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 20:56:48,343 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 20:56:48,363 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-12-06 20:56:48,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 20:56:48,545 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 20:56:48,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 20:56:48,547 INFO L85 PathProgramCache]: Analyzing trace with hash -2044441341, now seen corresponding path program 3 times [2021-12-06 20:56:48,547 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 20:56:48,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [331783124] [2021-12-06 20:56:48,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 20:56:48,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 20:56:48,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 20:56:48,813 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-06 20:56:48,813 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 20:56:48,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [331783124] [2021-12-06 20:56:48,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [331783124] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 20:56:48,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1591237430] [2021-12-06 20:56:48,814 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-06 20:56:48,814 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 20:56:48,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 20:56:48,814 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 20:56:48,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-06 20:56:48,890 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-06 20:56:48,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 20:56:48,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-06 20:56:48,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 20:56:48,960 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-12-06 20:56:48,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 20:56:49,021 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-12-06 20:56:49,021 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1591237430] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 20:56:49,021 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 20:56:49,021 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 5, 5] total 19 [2021-12-06 20:56:49,021 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373777053] [2021-12-06 20:56:49,021 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 20:56:49,022 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-06 20:56:49,022 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 20:56:49,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-06 20:56:49,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=237, Unknown=0, NotChecked=0, Total=342 [2021-12-06 20:56:49,023 INFO L87 Difference]: Start difference. First operand 54 states and 59 transitions. Second operand has 19 states, 19 states have (on average 3.526315789473684) internal successors, (67), 19 states have internal predecessors, (67), 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) [2021-12-06 20:56:49,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 20:56:49,124 INFO L93 Difference]: Finished difference Result 120 states and 146 transitions. [2021-12-06 20:56:49,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-06 20:56:49,124 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.526315789473684) internal successors, (67), 19 states have internal predecessors, (67), 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 51 [2021-12-06 20:56:49,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 20:56:49,125 INFO L225 Difference]: With dead ends: 120 [2021-12-06 20:56:49,125 INFO L226 Difference]: Without dead ends: 89 [2021-12-06 20:56:49,126 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=237, Unknown=0, NotChecked=0, Total=342 [2021-12-06 20:56:49,127 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 59 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-06 20:56:49,127 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 75 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-06 20:56:49,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-12-06 20:56:49,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2021-12-06 20:56:49,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 87 states have (on average 1.0689655172413792) internal successors, (93), 87 states have internal predecessors, (93), 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) [2021-12-06 20:56:49,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 93 transitions. [2021-12-06 20:56:49,135 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 93 transitions. Word has length 51 [2021-12-06 20:56:49,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 20:56:49,135 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 93 transitions. [2021-12-06 20:56:49,135 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.526315789473684) internal successors, (67), 19 states have internal predecessors, (67), 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) [2021-12-06 20:56:49,135 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 93 transitions. [2021-12-06 20:56:49,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-12-06 20:56:49,137 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 20:56:49,137 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 20:56:49,158 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-12-06 20:56:49,338 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 20:56:49,340 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 20:56:49,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 20:56:49,341 INFO L85 PathProgramCache]: Analyzing trace with hash 1514226337, now seen corresponding path program 4 times [2021-12-06 20:56:49,341 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 20:56:49,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958078239] [2021-12-06 20:56:49,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 20:56:49,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 20:56:49,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 20:56:49,580 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-12-06 20:56:49,581 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 20:56:49,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958078239] [2021-12-06 20:56:49,581 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [958078239] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 20:56:49,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1594648193] [2021-12-06 20:56:49,581 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-06 20:56:49,581 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 20:56:49,581 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 20:56:49,582 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 20:56:49,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-06 20:56:49,676 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-06 20:56:49,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 20:56:49,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-06 20:56:49,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 20:56:49,775 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 229 trivial. 0 not checked. [2021-12-06 20:56:49,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 20:56:49,911 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 229 trivial. 0 not checked. [2021-12-06 20:56:49,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1594648193] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 20:56:49,911 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 20:56:49,911 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9, 9] total 28 [2021-12-06 20:56:49,912 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412611396] [2021-12-06 20:56:49,912 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 20:56:49,912 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-12-06 20:56:49,912 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 20:56:49,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-12-06 20:56:49,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=546, Unknown=0, NotChecked=0, Total=756 [2021-12-06 20:56:49,914 INFO L87 Difference]: Start difference. First operand 88 states and 93 transitions. Second operand has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 28 states have internal predecessors, (85), 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) [2021-12-06 20:56:50,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 20:56:50,127 INFO L93 Difference]: Finished difference Result 218 states and 260 transitions. [2021-12-06 20:56:50,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-12-06 20:56:50,127 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 28 states have internal predecessors, (85), 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 85 [2021-12-06 20:56:50,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 20:56:50,128 INFO L225 Difference]: With dead ends: 218 [2021-12-06 20:56:50,128 INFO L226 Difference]: Without dead ends: 155 [2021-12-06 20:56:50,129 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=210, Invalid=546, Unknown=0, NotChecked=0, Total=756 [2021-12-06 20:56:50,130 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 131 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 197 mSolverCounterSat, 148 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 345 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 148 IncrementalHoareTripleChecker+Valid, 197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-06 20:56:50,130 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [131 Valid, 102 Invalid, 345 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [148 Valid, 197 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-06 20:56:50,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-12-06 20:56:50,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 154. [2021-12-06 20:56:50,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 153 states have (on average 1.0392156862745099) internal successors, (159), 153 states have internal predecessors, (159), 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) [2021-12-06 20:56:50,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 159 transitions. [2021-12-06 20:56:50,141 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 159 transitions. Word has length 85 [2021-12-06 20:56:50,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 20:56:50,141 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 159 transitions. [2021-12-06 20:56:50,141 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 28 states have internal predecessors, (85), 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) [2021-12-06 20:56:50,141 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 159 transitions. [2021-12-06 20:56:50,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-12-06 20:56:50,143 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 20:56:50,143 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 14, 14, 14, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 20:56:50,164 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-06 20:56:50,344 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-12-06 20:56:50,344 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 20:56:50,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 20:56:50,344 INFO L85 PathProgramCache]: Analyzing trace with hash -44527969, now seen corresponding path program 5 times [2021-12-06 20:56:50,344 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 20:56:50,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1765408837] [2021-12-06 20:56:50,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 20:56:50,345 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 20:56:50,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 20:56:50,543 INFO L134 CoverageAnalysis]: Checked inductivity of 928 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 784 trivial. 0 not checked. [2021-12-06 20:56:50,543 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 20:56:50,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1765408837] [2021-12-06 20:56:50,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1765408837] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 20:56:50,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [64784777] [2021-12-06 20:56:50,544 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-06 20:56:50,544 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 20:56:50,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 20:56:50,545 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 20:56:50,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3bf50cbb-9190-4607-9999-e5ec9e173e8e/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process