./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-ext3-properties/sll_length_check-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/config/AutomizerReach.xml -i ../../sv-benchmarks/c/list-ext3-properties/sll_length_check-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU --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 528fbc32d9aa1d8a4eedfd9ab07830e3af97eea6ef37fe4df10e8aa3c9d21936 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-02 22:50:47,217 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-02 22:50:47,221 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-02 22:50:47,274 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-02 22:50:47,275 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-02 22:50:47,280 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-02 22:50:47,282 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-02 22:50:47,286 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-02 22:50:47,289 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-02 22:50:47,295 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-02 22:50:47,296 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-02 22:50:47,298 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-02 22:50:47,299 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-02 22:50:47,302 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-02 22:50:47,304 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-02 22:50:47,308 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-02 22:50:47,310 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-02 22:50:47,312 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-02 22:50:47,314 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-02 22:50:47,322 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-02 22:50:47,324 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-02 22:50:47,326 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-02 22:50:47,329 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-02 22:50:47,330 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-02 22:50:47,340 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-02 22:50:47,340 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-02 22:50:47,341 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-02 22:50:47,343 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-02 22:50:47,344 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-02 22:50:47,345 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-02 22:50:47,346 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-02 22:50:47,347 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-02 22:50:47,349 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-02 22:50:47,350 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-02 22:50:47,352 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-02 22:50:47,352 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-02 22:50:47,353 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-02 22:50:47,354 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-02 22:50:47,354 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-02 22:50:47,355 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-02 22:50:47,356 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-02 22:50:47,359 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-02 22:50:47,404 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-02 22:50:47,404 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-02 22:50:47,405 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-02 22:50:47,405 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-02 22:50:47,414 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-02 22:50:47,414 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-02 22:50:47,414 INFO L138 SettingsManager]: * Use SBE=true [2021-11-02 22:50:47,415 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-02 22:50:47,415 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-02 22:50:47,415 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-02 22:50:47,416 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-02 22:50:47,416 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-02 22:50:47,417 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-02 22:50:47,417 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-02 22:50:47,417 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-02 22:50:47,417 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-02 22:50:47,418 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-02 22:50:47,418 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-02 22:50:47,418 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-02 22:50:47,418 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-02 22:50:47,419 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-02 22:50:47,419 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-02 22:50:47,419 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:50:47,419 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-02 22:50:47,420 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-02 22:50:47,420 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-02 22:50:47,420 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-02 22:50:47,420 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-02 22:50:47,421 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-02 22:50:47,422 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-02 22:50:47,423 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-02 22:50:47,423 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-02 22:50:47,423 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_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 528fbc32d9aa1d8a4eedfd9ab07830e3af97eea6ef37fe4df10e8aa3c9d21936 [2021-11-02 22:50:47,749 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-02 22:50:47,782 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-02 22:50:47,785 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-02 22:50:47,787 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-02 22:50:47,787 INFO L275 PluginConnector]: CDTParser initialized [2021-11-02 22:50:47,788 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/../../sv-benchmarks/c/list-ext3-properties/sll_length_check-1.i [2021-11-02 22:50:47,880 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/data/b3941337b/3e947da2814946bb9baa9c0fc8fa6ea9/FLAG4e4fa6834 [2021-11-02 22:50:48,522 INFO L306 CDTParser]: Found 1 translation units. [2021-11-02 22:50:48,523 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/sv-benchmarks/c/list-ext3-properties/sll_length_check-1.i [2021-11-02 22:50:48,547 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/data/b3941337b/3e947da2814946bb9baa9c0fc8fa6ea9/FLAG4e4fa6834 [2021-11-02 22:50:48,793 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/data/b3941337b/3e947da2814946bb9baa9c0fc8fa6ea9 [2021-11-02 22:50:48,795 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-02 22:50:48,797 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-02 22:50:48,804 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-02 22:50:48,804 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-02 22:50:48,808 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-02 22:50:48,809 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:50:48" (1/1) ... [2021-11-02 22:50:48,810 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@51381edd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:48, skipping insertion in model container [2021-11-02 22:50:48,812 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:50:48" (1/1) ... [2021-11-02 22:50:48,819 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-02 22:50:48,877 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-02 22:50:49,184 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_ac281e99-8410-4697-bca4-7152586885e5/sv-benchmarks/c/list-ext3-properties/sll_length_check-1.i[23818,23831] [2021-11-02 22:50:49,189 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:50:49,197 INFO L203 MainTranslator]: Completed pre-run [2021-11-02 22:50:49,263 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_ac281e99-8410-4697-bca4-7152586885e5/sv-benchmarks/c/list-ext3-properties/sll_length_check-1.i[23818,23831] [2021-11-02 22:50:49,264 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:50:49,302 INFO L208 MainTranslator]: Completed translation [2021-11-02 22:50:49,304 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:49 WrapperNode [2021-11-02 22:50:49,304 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-02 22:50:49,305 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-02 22:50:49,305 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-02 22:50:49,305 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-02 22:50:49,313 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:49" (1/1) ... [2021-11-02 22:50:49,330 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:49" (1/1) ... [2021-11-02 22:50:49,359 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-02 22:50:49,360 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-02 22:50:49,360 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-02 22:50:49,360 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-02 22:50:49,369 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:49" (1/1) ... [2021-11-02 22:50:49,369 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:49" (1/1) ... [2021-11-02 22:50:49,381 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:49" (1/1) ... [2021-11-02 22:50:49,382 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:49" (1/1) ... [2021-11-02 22:50:49,395 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:49" (1/1) ... [2021-11-02 22:50:49,399 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:49" (1/1) ... [2021-11-02 22:50:49,401 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:49" (1/1) ... [2021-11-02 22:50:49,404 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-02 22:50:49,405 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-02 22:50:49,405 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-02 22:50:49,405 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-02 22:50:49,406 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:49" (1/1) ... [2021-11-02 22:50:49,414 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:50:49,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:50:49,437 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-02 22:50:49,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-02 22:50:49,489 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-02 22:50:49,490 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-02 22:50:49,490 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-02 22:50:49,490 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-02 22:50:49,490 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-02 22:50:49,491 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-02 22:50:49,491 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-02 22:50:49,492 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-02 22:50:49,829 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-02 22:50:49,842 INFO L299 CfgBuilder]: Removed 16 assume(true) statements. [2021-11-02 22:50:49,845 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:50:49 BoogieIcfgContainer [2021-11-02 22:50:49,845 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-02 22:50:49,847 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-02 22:50:49,847 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-02 22:50:49,850 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-02 22:50:49,851 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 10:50:48" (1/3) ... [2021-11-02 22:50:49,851 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37095d09 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:50:49, skipping insertion in model container [2021-11-02 22:50:49,852 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:49" (2/3) ... [2021-11-02 22:50:49,852 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37095d09 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:50:49, skipping insertion in model container [2021-11-02 22:50:49,852 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:50:49" (3/3) ... [2021-11-02 22:50:49,854 INFO L111 eAbstractionObserver]: Analyzing ICFG sll_length_check-1.i [2021-11-02 22:50:49,875 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-02 22:50:49,875 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-02 22:50:49,939 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-02 22:50:49,945 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 [2021-11-02 22:50:49,945 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-02 22:50:49,960 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 22 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) [2021-11-02 22:50:49,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-02 22:50:49,966 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:49,967 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:50:49,967 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:50:49,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:49,973 INFO L85 PathProgramCache]: Analyzing trace with hash -1050078975, now seen corresponding path program 1 times [2021-11-02 22:50:49,982 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:49,983 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319616079] [2021-11-02 22:50:49,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:50,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:50,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:50,208 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:50:50,209 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:50:50,210 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [319616079] [2021-11-02 22:50:50,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [319616079] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:50:50,212 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:50:50,212 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-02 22:50:50,216 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573789166] [2021-11-02 22:50:50,222 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-02 22:50:50,222 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:50:50,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-02 22:50:50,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-02 22:50:50,242 INFO L87 Difference]: Start difference. First operand has 23 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 22 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) Second operand has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:50:50,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:50:50,263 INFO L93 Difference]: Finished difference Result 41 states and 58 transitions. [2021-11-02 22:50:50,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-02 22:50:50,264 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-02 22:50:50,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:50:50,273 INFO L225 Difference]: With dead ends: 41 [2021-11-02 22:50:50,273 INFO L226 Difference]: Without dead ends: 17 [2021-11-02 22:50:50,298 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-02 22:50:50,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-02 22:50:50,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-02 22:50:50,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.25) internal successors, (20), 16 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) [2021-11-02 22:50:50,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2021-11-02 22:50:50,331 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 12 [2021-11-02 22:50:50,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:50:50,332 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2021-11-02 22:50:50,332 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:50:50,332 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2021-11-02 22:50:50,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-02 22:50:50,333 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:50,333 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:50:50,334 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-02 22:50:50,334 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:50:50,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:50,338 INFO L85 PathProgramCache]: Analyzing trace with hash 924106356, now seen corresponding path program 1 times [2021-11-02 22:50:50,338 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:50,338 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409294610] [2021-11-02 22:50:50,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:50,339 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:50,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:50,534 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:50:50,534 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:50:50,534 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409294610] [2021-11-02 22:50:50,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [409294610] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:50:50,535 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:50:50,535 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:50:50,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621748637] [2021-11-02 22:50:50,537 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:50:50,537 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:50:50,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:50:50,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:50:50,539 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 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) [2021-11-02 22:50:50,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:50:50,585 INFO L93 Difference]: Finished difference Result 43 states and 50 transitions. [2021-11-02 22:50:50,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:50:50,586 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 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 14 [2021-11-02 22:50:50,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:50:50,587 INFO L225 Difference]: With dead ends: 43 [2021-11-02 22:50:50,587 INFO L226 Difference]: Without dead ends: 35 [2021-11-02 22:50:50,588 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:50:50,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-02 22:50:50,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 22. [2021-11-02 22:50:50,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 21 states have internal predecessors, (27), 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) [2021-11-02 22:50:50,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2021-11-02 22:50:50,595 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 14 [2021-11-02 22:50:50,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:50:50,595 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2021-11-02 22:50:50,595 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 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) [2021-11-02 22:50:50,596 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2021-11-02 22:50:50,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-02 22:50:50,596 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:50,597 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:50:50,597 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-02 22:50:50,597 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:50:50,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:50,598 INFO L85 PathProgramCache]: Analyzing trace with hash 1149244957, now seen corresponding path program 1 times [2021-11-02 22:50:50,598 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:50,599 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [229556917] [2021-11-02 22:50:50,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:50,599 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:50,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:50,684 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:50:50,684 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:50:50,685 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [229556917] [2021-11-02 22:50:50,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [229556917] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:50:50,685 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:50:50,685 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-02 22:50:50,686 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272448355] [2021-11-02 22:50:50,686 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 22:50:50,687 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:50:50,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 22:50:50,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-02 22:50:50,688 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 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) [2021-11-02 22:50:50,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:50:50,754 INFO L93 Difference]: Finished difference Result 39 states and 45 transitions. [2021-11-02 22:50:50,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:50:50,755 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 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 [2021-11-02 22:50:50,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:50:50,756 INFO L225 Difference]: With dead ends: 39 [2021-11-02 22:50:50,756 INFO L226 Difference]: Without dead ends: 34 [2021-11-02 22:50:50,757 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:50:50,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-02 22:50:50,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 26. [2021-11-02 22:50:50,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.28) internal successors, (32), 25 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) [2021-11-02 22:50:50,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2021-11-02 22:50:50,764 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 17 [2021-11-02 22:50:50,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:50:50,764 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2021-11-02 22:50:50,765 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 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) [2021-11-02 22:50:50,765 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2021-11-02 22:50:50,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-02 22:50:50,766 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:50,766 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:50:50,766 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-02 22:50:50,767 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:50:50,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:50,767 INFO L85 PathProgramCache]: Analyzing trace with hash -1798757859, now seen corresponding path program 1 times [2021-11-02 22:50:50,768 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:50,768 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993486793] [2021-11-02 22:50:50,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:50,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:50,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:50,827 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:50:50,828 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:50:50,828 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993486793] [2021-11-02 22:50:50,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [993486793] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:50:50,829 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1088330570] [2021-11-02 22:50:50,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:50,829 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:50:50,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:50:50,831 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:50:50,859 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-02 22:50:50,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:50,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-02 22:50:50,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:50:51,060 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:50:51,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1088330570] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:50:51,062 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:50:51,063 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 6 [2021-11-02 22:50:51,063 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130297001] [2021-11-02 22:50:51,064 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:50:51,065 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:50:51,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:50:51,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-02 22:50:51,068 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 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) [2021-11-02 22:50:51,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:50:51,117 INFO L93 Difference]: Finished difference Result 46 states and 53 transitions. [2021-11-02 22:50:51,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:50:51,118 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 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 [2021-11-02 22:50:51,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:50:51,119 INFO L225 Difference]: With dead ends: 46 [2021-11-02 22:50:51,119 INFO L226 Difference]: Without dead ends: 38 [2021-11-02 22:50:51,120 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:50:51,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-02 22:50:51,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 19. [2021-11-02 22:50:51,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 18 states have internal predecessors, (22), 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) [2021-11-02 22:50:51,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2021-11-02 22:50:51,126 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 17 [2021-11-02 22:50:51,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:50:51,126 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2021-11-02 22:50:51,126 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 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) [2021-11-02 22:50:51,127 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2021-11-02 22:50:51,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-02 22:50:51,127 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:51,127 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:50:51,167 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-02 22:50:51,355 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:50:51,355 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:50:51,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:51,356 INFO L85 PathProgramCache]: Analyzing trace with hash 1318509563, now seen corresponding path program 1 times [2021-11-02 22:50:51,356 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:51,356 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1741316076] [2021-11-02 22:50:51,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:51,357 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:51,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:51,465 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:50:51,465 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:50:51,466 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1741316076] [2021-11-02 22:50:51,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1741316076] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:50:51,466 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [647611409] [2021-11-02 22:50:51,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:51,467 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:50:51,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:50:51,468 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:50:51,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-02 22:50:51,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:51,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-02 22:50:51,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:50:51,657 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:50:51,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [647611409] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:50:51,658 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:50:51,658 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-11-02 22:50:51,658 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381945367] [2021-11-02 22:50:51,659 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:50:51,660 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:50:51,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:50:51,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:50:51,662 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 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) [2021-11-02 22:50:51,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:50:51,754 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2021-11-02 22:50:51,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:50:51,756 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-02 22:50:51,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:50:51,757 INFO L225 Difference]: With dead ends: 55 [2021-11-02 22:50:51,757 INFO L226 Difference]: Without dead ends: 46 [2021-11-02 22:50:51,758 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:50:51,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-02 22:50:51,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 22. [2021-11-02 22:50:51,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 21 states have internal predecessors, (25), 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) [2021-11-02 22:50:51,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2021-11-02 22:50:51,765 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 18 [2021-11-02 22:50:51,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:50:51,765 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2021-11-02 22:50:51,766 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 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) [2021-11-02 22:50:51,766 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2021-11-02 22:50:51,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-02 22:50:51,767 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:51,767 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:50:51,812 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-02 22:50:51,983 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:50:51,983 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:50:51,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:51,984 INFO L85 PathProgramCache]: Analyzing trace with hash -2117322972, now seen corresponding path program 2 times [2021-11-02 22:50:51,984 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:51,985 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1449007439] [2021-11-02 22:50:51,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:51,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:52,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:52,078 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:50:52,082 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:50:52,082 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1449007439] [2021-11-02 22:50:52,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1449007439] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:50:52,083 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [168991857] [2021-11-02 22:50:52,083 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:50:52,083 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:50:52,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:50:52,091 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:50:52,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-02 22:50:52,185 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:50:52,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:50:52,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-02 22:50:52,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:50:52,289 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:50:52,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [168991857] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:50:52,290 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:50:52,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2021-11-02 22:50:52,290 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202162307] [2021-11-02 22:50:52,292 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:50:52,292 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:50:52,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:50:52,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:50:52,293 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 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) [2021-11-02 22:50:52,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:50:52,379 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2021-11-02 22:50:52,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 22:50:52,380 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-02 22:50:52,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:50:52,383 INFO L225 Difference]: With dead ends: 57 [2021-11-02 22:50:52,383 INFO L226 Difference]: Without dead ends: 48 [2021-11-02 22:50:52,384 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:50:52,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-02 22:50:52,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 25. [2021-11-02 22:50:52,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 24 states have internal predecessors, (28), 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) [2021-11-02 22:50:52,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-11-02 22:50:52,402 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 21 [2021-11-02 22:50:52,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:50:52,403 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-11-02 22:50:52,403 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 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) [2021-11-02 22:50:52,403 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-11-02 22:50:52,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-02 22:50:52,405 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:52,405 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:50:52,441 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-02 22:50:52,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:50:52,631 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:50:52,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:52,632 INFO L85 PathProgramCache]: Analyzing trace with hash -1343774885, now seen corresponding path program 3 times [2021-11-02 22:50:52,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:52,632 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1103136936] [2021-11-02 22:50:52,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:52,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:52,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:52,727 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:50:52,728 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:50:52,728 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1103136936] [2021-11-02 22:50:52,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1103136936] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:50:52,728 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1115039483] [2021-11-02 22:50:52,728 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:50:52,729 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:50:52,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:50:52,730 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:50:52,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-02 22:50:52,840 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-02 22:50:52,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:50:52,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-02 22:50:52,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:50:52,990 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-02 22:50:53,124 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2021-11-02 22:50:53,140 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:50:53,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1115039483] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:50:53,141 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:50:53,141 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2021-11-02 22:50:53,142 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143287157] [2021-11-02 22:50:53,142 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:50:53,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:50:53,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:50:53,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:50:53,144 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 12 states have internal predecessors, (31), 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) [2021-11-02 22:50:53,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:50:53,323 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2021-11-02 22:50:53,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:50:53,324 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 12 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-02 22:50:53,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:50:53,325 INFO L225 Difference]: With dead ends: 31 [2021-11-02 22:50:53,325 INFO L226 Difference]: Without dead ends: 26 [2021-11-02 22:50:53,326 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=85, Invalid=221, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:50:53,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-02 22:50:53,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-02 22:50:53,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.16) internal successors, (29), 25 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) [2021-11-02 22:50:53,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2021-11-02 22:50:53,331 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 24 [2021-11-02 22:50:53,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:50:53,331 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2021-11-02 22:50:53,332 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 12 states have internal predecessors, (31), 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) [2021-11-02 22:50:53,332 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2021-11-02 22:50:53,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-02 22:50:53,333 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:53,333 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:50:53,373 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-02 22:50:53,558 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:50:53,559 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:50:53,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:53,559 INFO L85 PathProgramCache]: Analyzing trace with hash 1344305789, now seen corresponding path program 4 times [2021-11-02 22:50:53,560 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:53,560 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1783802252] [2021-11-02 22:50:53,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:53,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:53,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:53,701 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-02 22:50:53,701 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:50:53,701 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1783802252] [2021-11-02 22:50:53,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1783802252] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:50:53,702 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1916223765] [2021-11-02 22:50:53,702 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:50:53,702 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:50:53,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:50:53,704 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:50:53,712 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-02 22:50:53,808 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:50:53,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:50:53,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-02 22:50:53,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:50:53,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-02 22:50:54,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-02 22:50:54,050 INFO L354 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2021-11-02 22:50:54,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 23 [2021-11-02 22:50:54,223 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 30 [2021-11-02 22:50:54,323 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:50:54,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 23 [2021-11-02 22:50:54,360 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:50:54,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1916223765] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:50:54,360 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:50:54,361 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 12] total 18 [2021-11-02 22:50:54,361 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346742229] [2021-11-02 22:50:54,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-02 22:50:54,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:50:54,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-02 22:50:54,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:50:54,363 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:50:55,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:50:55,047 INFO L93 Difference]: Finished difference Result 61 states and 68 transitions. [2021-11-02 22:50:55,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-02 22:50:55,048 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-02 22:50:55,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:50:55,048 INFO L225 Difference]: With dead ends: 61 [2021-11-02 22:50:55,048 INFO L226 Difference]: Without dead ends: 56 [2021-11-02 22:50:55,049 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 199 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=279, Invalid=911, Unknown=0, NotChecked=0, Total=1190 [2021-11-02 22:50:55,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-02 22:50:55,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 27. [2021-11-02 22:50:55,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 26 states have internal predecessors, (30), 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) [2021-11-02 22:50:55,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2021-11-02 22:50:55,056 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 25 [2021-11-02 22:50:55,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:50:55,057 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2021-11-02 22:50:55,057 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:50:55,057 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2021-11-02 22:50:55,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-02 22:50:55,058 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:55,058 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:50:55,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-02 22:50:55,277 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:50:55,277 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:50:55,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:55,278 INFO L85 PathProgramCache]: Analyzing trace with hash -1224539237, now seen corresponding path program 5 times [2021-11-02 22:50:55,278 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:55,278 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1036974087] [2021-11-02 22:50:55,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:55,278 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:55,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-02 22:50:55,316 INFO L355 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-11-02 22:50:55,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-02 22:50:55,391 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-11-02 22:50:55,391 INFO L627 BasicCegarLoop]: Counterexample is feasible [2021-11-02 22:50:55,393 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-11-02 22:50:55,395 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-02 22:50:55,401 INFO L731 BasicCegarLoop]: Path program histogram: [5, 1, 1, 1, 1] [2021-11-02 22:50:55,405 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-02 22:50:55,443 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.11 10:50:55 BoogieIcfgContainer [2021-11-02 22:50:55,443 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-02 22:50:55,444 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-02 22:50:55,444 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-02 22:50:55,444 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-02 22:50:55,445 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:50:49" (3/4) ... [2021-11-02 22:50:55,447 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-11-02 22:50:55,499 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/witness.graphml [2021-11-02 22:50:55,499 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-02 22:50:55,500 INFO L168 Benchmark]: Toolchain (without parser) took 6702.74 ms. Allocated memory was 100.7 MB in the beginning and 159.4 MB in the end (delta: 58.7 MB). Free memory was 65.8 MB in the beginning and 128.9 MB in the end (delta: -63.0 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-11-02 22:50:55,500 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 100.7 MB. Free memory was 72.7 MB in the beginning and 72.7 MB in the end (delta: 32.4 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-11-02 22:50:55,501 INFO L168 Benchmark]: CACSL2BoogieTranslator took 500.37 ms. Allocated memory is still 100.7 MB. Free memory was 65.8 MB in the beginning and 69.1 MB in the end (delta: -3.3 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2021-11-02 22:50:55,501 INFO L168 Benchmark]: Boogie Procedure Inliner took 54.38 ms. Allocated memory is still 100.7 MB. Free memory was 69.1 MB in the beginning and 67.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-11-02 22:50:55,502 INFO L168 Benchmark]: Boogie Preprocessor took 44.43 ms. Allocated memory is still 100.7 MB. Free memory was 67.0 MB in the beginning and 65.8 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-11-02 22:50:55,502 INFO L168 Benchmark]: RCFGBuilder took 439.95 ms. Allocated memory is still 100.7 MB. Free memory was 65.8 MB in the beginning and 54.3 MB in the end (delta: 11.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-11-02 22:50:55,503 INFO L168 Benchmark]: TraceAbstraction took 5596.64 ms. Allocated memory was 100.7 MB in the beginning and 159.4 MB in the end (delta: 58.7 MB). Free memory was 54.1 MB in the beginning and 132.0 MB in the end (delta: -77.9 MB). Peak memory consumption was 40.7 MB. Max. memory is 16.1 GB. [2021-11-02 22:50:55,503 INFO L168 Benchmark]: Witness Printer took 55.17 ms. Allocated memory is still 159.4 MB. Free memory was 132.0 MB in the beginning and 128.9 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-11-02 22:50:55,506 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 100.7 MB. Free memory was 72.7 MB in the beginning and 72.7 MB in the end (delta: 32.4 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 500.37 ms. Allocated memory is still 100.7 MB. Free memory was 65.8 MB in the beginning and 69.1 MB in the end (delta: -3.3 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 54.38 ms. Allocated memory is still 100.7 MB. Free memory was 69.1 MB in the beginning and 67.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 44.43 ms. Allocated memory is still 100.7 MB. Free memory was 67.0 MB in the beginning and 65.8 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 439.95 ms. Allocated memory is still 100.7 MB. Free memory was 65.8 MB in the beginning and 54.3 MB in the end (delta: 11.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 5596.64 ms. Allocated memory was 100.7 MB in the beginning and 159.4 MB in the end (delta: 58.7 MB). Free memory was 54.1 MB in the beginning and 132.0 MB in the end (delta: -77.9 MB). Peak memory consumption was 40.7 MB. Max. memory is 16.1 GB. * Witness Printer took 55.17 ms. Allocated memory is still 159.4 MB. Free memory was 132.0 MB in the beginning and 128.9 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 613]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L603] int len = 2; [L604] len < 32 && __VERIFIER_nondet_int() [L604] len < 32 && __VERIFIER_nondet_int() [L604] COND FALSE !(len < 32 && __VERIFIER_nondet_int()) [L575] SLL head = ((void *)0); [L576] COND TRUE len > 0 [L577] SLL new_head = (SLL) malloc(sizeof(struct node)); [L578] COND FALSE !(((void *)0) == new_head) [L581] new_head->next = head [L582] head = new_head [L583] len-- [L576] COND TRUE len > 0 [L577] SLL new_head = (SLL) malloc(sizeof(struct node)); [L578] COND FALSE !(((void *)0) == new_head) [L581] new_head->next = head [L582] head = new_head [L583] len-- [L576] COND TRUE len > 0 [L577] SLL new_head = (SLL) malloc(sizeof(struct node)); [L578] COND FALSE !(((void *)0) == new_head) [L581] new_head->next = head [L582] head = new_head [L583] len-- [L576] COND FALSE !(len > 0) [L585] return head; [L607] SLL s = sll_create(len + 1); [L588] int len = 0; [L589] COND TRUE \read(head) [L590] len++ [L591] EXPR head->next [L591] head = head->next [L589] COND TRUE \read(head) [L590] len++ [L591] EXPR head->next [L591] head = head->next [L589] COND TRUE \read(head) [L590] len++ [L591] EXPR head->next [L591] head = head->next [L589] COND FALSE !(\read(head)) [L593] return len; [L608] COND TRUE len != sll_length(s) [L613] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 5.4s, OverallIterations: 9, TraceHistogramMax: 3, PathProgramHistogramMax: 5, EmptinessCheckTime: 0.0s, AutomataDifference: 1.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 150 SDtfs, 333 SDslu, 439 SDs, 0 SdLazy, 396 SolverSat, 82 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 180 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 262 ImplicationChecksByTransitivity, 1.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=27occurred in iteration=8, InterpolantAutomatonStates: 65, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 8 MinimizatonAttempts, 116 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.8s InterpolantComputationTime, 279 NumberOfCodeBlocks, 275 NumberOfCodeBlocksAsserted, 18 NumberOfCheckSat, 240 ConstructedInterpolants, 1 QuantifiedInterpolants, 844 SizeOfPredicates, 33 NumberOfNonLiveVariables, 542 ConjunctsInSsa, 89 ConjunctsInUnsatCore, 13 InterpolantComputations, 4 PerfectInterpolantSequences, 44/79 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-11-02 22:50:55,563 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac281e99-8410-4697-bca4-7152586885e5/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE