./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/config/AutomizerReach.xml -i ../../sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/config/svcomp-Reach-64bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF --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 64bit --witnessprinter.graph.data.programhash 39617118f1cddf1edf0da2bed0d1b7ba56db146c1be6da9375c591252f5b5d55 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 07:24:30,202 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 07:24:30,205 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 07:24:30,255 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 07:24:30,255 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 07:24:30,260 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 07:24:30,263 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 07:24:30,268 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 07:24:30,271 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 07:24:30,279 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 07:24:30,280 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 07:24:30,282 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 07:24:30,283 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 07:24:30,285 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 07:24:30,288 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 07:24:30,294 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 07:24:30,296 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 07:24:30,297 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 07:24:30,299 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 07:24:30,306 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 07:24:30,309 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 07:24:30,310 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 07:24:30,314 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 07:24:30,315 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 07:24:30,321 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 07:24:30,322 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 07:24:30,322 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 07:24:30,324 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 07:24:30,325 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 07:24:30,326 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 07:24:30,327 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 07:24:30,328 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 07:24:30,330 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 07:24:30,332 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 07:24:30,334 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 07:24:30,334 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 07:24:30,335 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 07:24:30,335 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 07:24:30,336 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 07:24:30,337 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 07:24:30,337 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 07:24:30,338 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/config/svcomp-Reach-64bit-Automizer_Default.epf [2021-11-20 07:24:30,388 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 07:24:30,390 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 07:24:30,391 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 07:24:30,392 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 07:24:30,398 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 07:24:30,399 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 07:24:30,400 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-20 07:24:30,400 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-20 07:24:30,400 INFO L138 SettingsManager]: * Use SBE=true [2021-11-20 07:24:30,400 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 07:24:30,402 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 07:24:30,402 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 07:24:30,402 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 07:24:30,402 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 07:24:30,403 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 07:24:30,403 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 07:24:30,403 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 07:24:30,403 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 07:24:30,404 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 07:24:30,404 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-20 07:24:30,404 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 07:24:30,404 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 07:24:30,405 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 07:24:30,405 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 07:24:30,405 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 07:24:30,405 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-20 07:24:30,406 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 07:24:30,406 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-20 07:24:30,406 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-20 07:24:30,408 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 07:24:30,408 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 07:24:30,408 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_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 39617118f1cddf1edf0da2bed0d1b7ba56db146c1be6da9375c591252f5b5d55 [2021-11-20 07:24:30,673 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 07:24:30,709 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 07:24:30,712 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 07:24:30,713 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 07:24:30,714 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 07:24:30,715 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/../../sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i [2021-11-20 07:24:30,777 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/data/874638e0c/19038323a21648489d7f3324a2ebf06d/FLAGe99c80fde [2021-11-20 07:24:31,514 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 07:24:31,515 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i [2021-11-20 07:24:31,554 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/data/874638e0c/19038323a21648489d7f3324a2ebf06d/FLAGe99c80fde [2021-11-20 07:24:31,592 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/data/874638e0c/19038323a21648489d7f3324a2ebf06d [2021-11-20 07:24:31,595 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 07:24:31,598 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 07:24:31,599 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 07:24:31,600 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 07:24:31,603 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 07:24:31,604 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 07:24:31" (1/1) ... [2021-11-20 07:24:31,605 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5a1906a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:24:31, skipping insertion in model container [2021-11-20 07:24:31,605 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 07:24:31" (1/1) ... [2021-11-20 07:24:31,612 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 07:24:31,727 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 07:24:32,045 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i[4500,4513] [2021-11-20 07:24:32,053 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i[4560,4573] [2021-11-20 07:24:33,019 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,020 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,021 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,022 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,023 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,038 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,039 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,041 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,042 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,044 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,045 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,046 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,046 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,434 WARN L610 FunctionHandler]: implicit declaration of function __atomic_load_n [2021-11-20 07:24:33,435 WARN L610 FunctionHandler]: implicit declaration of function __atomic_store_n [2021-11-20 07:24:33,436 WARN L610 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2021-11-20 07:24:33,438 WARN L610 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2021-11-20 07:24:33,440 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2021-11-20 07:24:33,441 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2021-11-20 07:24:33,441 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2021-11-20 07:24:33,442 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2021-11-20 07:24:33,443 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2021-11-20 07:24:33,444 WARN L610 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2021-11-20 07:24:33,613 WARN L610 FunctionHandler]: implicit declaration of function __builtin_va_copy [2021-11-20 07:24:33,665 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 07:24:33,685 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 07:24:33,698 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i[4500,4513] [2021-11-20 07:24:33,698 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i[4560,4573] [2021-11-20 07:24:33,739 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,739 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,740 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,740 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,741 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,748 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,749 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,750 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,751 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,752 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,753 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,754 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,754 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-20 07:24:33,845 WARN L610 FunctionHandler]: implicit declaration of function __atomic_load_n [2021-11-20 07:24:33,846 WARN L610 FunctionHandler]: implicit declaration of function __atomic_store_n [2021-11-20 07:24:33,847 WARN L610 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2021-11-20 07:24:33,848 WARN L610 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2021-11-20 07:24:33,849 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2021-11-20 07:24:33,850 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2021-11-20 07:24:33,851 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2021-11-20 07:24:33,853 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2021-11-20 07:24:33,854 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2021-11-20 07:24:33,855 WARN L610 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2021-11-20 07:24:33,900 WARN L610 FunctionHandler]: implicit declaration of function __builtin_va_copy [2021-11-20 07:24:33,959 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 07:24:34,233 INFO L208 MainTranslator]: Completed translation [2021-11-20 07:24:34,234 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:24:34 WrapperNode [2021-11-20 07:24:34,234 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 07:24:34,235 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 07:24:34,235 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 07:24:34,236 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 07:24:34,243 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:24:34" (1/1) ... [2021-11-20 07:24:34,345 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:24:34" (1/1) ... [2021-11-20 07:24:34,393 INFO L137 Inliner]: procedures = 679, calls = 1032, calls flagged for inlining = 48, calls inlined = 3, statements flattened = 29 [2021-11-20 07:24:34,394 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 07:24:34,396 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 07:24:34,396 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 07:24:34,396 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 07:24:34,405 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:24:34" (1/1) ... [2021-11-20 07:24:34,405 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:24:34" (1/1) ... [2021-11-20 07:24:34,413 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:24:34" (1/1) ... [2021-11-20 07:24:34,414 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:24:34" (1/1) ... [2021-11-20 07:24:34,447 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:24:34" (1/1) ... [2021-11-20 07:24:34,450 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:24:34" (1/1) ... [2021-11-20 07:24:34,456 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:24:34" (1/1) ... [2021-11-20 07:24:34,470 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 07:24:34,471 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 07:24:34,477 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 07:24:34,477 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 07:24:34,478 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:24:34" (1/1) ... [2021-11-20 07:24:34,487 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 07:24:34,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:24:34,516 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 07:24:34,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 07:24:34,571 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_node_reset [2021-11-20 07:24:34,571 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_node_reset [2021-11-20 07:24:34,572 INFO L130 BoogieDeclarations]: Found specification of procedure aws_is_mem_zeroed [2021-11-20 07:24:34,572 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_is_mem_zeroed [2021-11-20 07:24:34,572 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 07:24:34,572 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 07:24:34,573 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-20 07:24:34,574 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-20 07:24:34,574 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 07:24:34,575 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 07:24:34,575 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 07:24:34,575 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2021-11-20 07:24:34,575 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2021-11-20 07:24:34,575 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-20 07:24:34,576 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-20 07:24:34,576 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 07:24:34,576 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-20 07:24:34,576 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 07:24:34,799 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 07:24:34,801 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 07:24:34,993 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 07:24:35,000 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 07:24:35,000 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-20 07:24:35,002 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 07:24:35 BoogieIcfgContainer [2021-11-20 07:24:35,002 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 07:24:35,004 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 07:24:35,005 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 07:24:35,013 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 07:24:35,013 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 07:24:31" (1/3) ... [2021-11-20 07:24:35,014 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16b73f3e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 07:24:35, skipping insertion in model container [2021-11-20 07:24:35,014 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:24:34" (2/3) ... [2021-11-20 07:24:35,015 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16b73f3e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 07:24:35, skipping insertion in model container [2021-11-20 07:24:35,016 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 07:24:35" (3/3) ... [2021-11-20 07:24:35,018 INFO L111 eAbstractionObserver]: Analyzing ICFG aws_linked_list_node_reset_harness.i [2021-11-20 07:24:35,024 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 07:24:35,024 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 07:24:35,088 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 07:24:35,100 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 [2021-11-20 07:24:35,104 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 07:24:35,128 INFO L276 IsEmpty]: Start isEmpty. Operand has 41 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 29 states have internal predecessors, (36), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-20 07:24:35,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-20 07:24:35,134 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:24:35,135 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:24:35,136 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:24:35,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:24:35,142 INFO L85 PathProgramCache]: Analyzing trace with hash -527313499, now seen corresponding path program 1 times [2021-11-20 07:24:35,153 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:24:35,153 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1029440125] [2021-11-20 07:24:35,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:24:35,155 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:24:35,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:35,490 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-11-20 07:24:35,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:35,521 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-20 07:24:35,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:35,555 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 07:24:35,556 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:24:35,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1029440125] [2021-11-20 07:24:35,557 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1029440125] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 07:24:35,557 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 07:24:35,557 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 07:24:35,559 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506337530] [2021-11-20 07:24:35,559 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 07:24:35,564 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-20 07:24:35,564 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:24:35,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-20 07:24:35,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-20 07:24:35,611 INFO L87 Difference]: Start difference. First operand has 41 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 29 states have internal predecessors, (36), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 7.0) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 07:24:35,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:24:35,646 INFO L93 Difference]: Finished difference Result 75 states and 96 transitions. [2021-11-20 07:24:35,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-20 07:24:35,649 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 7.0) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-11-20 07:24:35,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:24:35,657 INFO L225 Difference]: With dead ends: 75 [2021-11-20 07:24:35,658 INFO L226 Difference]: Without dead ends: 36 [2021-11-20 07:24:35,661 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-20 07:24:35,666 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 07:24:35,667 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 07:24:35,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-20 07:24:35,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-11-20 07:24:35,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-20 07:24:35,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2021-11-20 07:24:35,726 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 20 [2021-11-20 07:24:35,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:24:35,727 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2021-11-20 07:24:35,728 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 7.0) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 07:24:35,728 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2021-11-20 07:24:35,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-20 07:24:35,731 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:24:35,732 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:24:35,732 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 07:24:35,732 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:24:35,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:24:35,734 INFO L85 PathProgramCache]: Analyzing trace with hash 74286250, now seen corresponding path program 1 times [2021-11-20 07:24:35,737 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:24:35,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1689255736] [2021-11-20 07:24:35,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:24:35,742 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:24:35,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:35,927 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-11-20 07:24:35,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:35,969 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-11-20 07:24:35,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:36,054 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-20 07:24:36,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:36,073 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 07:24:36,073 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:24:36,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1689255736] [2021-11-20 07:24:36,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1689255736] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 07:24:36,074 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 07:24:36,074 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 07:24:36,075 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213691686] [2021-11-20 07:24:36,075 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 07:24:36,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 07:24:36,076 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:24:36,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 07:24:36,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 07:24:36,078 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 07:24:36,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:24:36,217 INFO L93 Difference]: Finished difference Result 61 states and 69 transitions. [2021-11-20 07:24:36,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 07:24:36,217 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-11-20 07:24:36,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:24:36,219 INFO L225 Difference]: With dead ends: 61 [2021-11-20 07:24:36,219 INFO L226 Difference]: Without dead ends: 37 [2021-11-20 07:24:36,220 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-20 07:24:36,221 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 22 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 07:24:36,222 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 84 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 07:24:36,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-20 07:24:36,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-11-20 07:24:36,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 25 states have internal predecessors, (28), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-20 07:24:36,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-11-20 07:24:36,232 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 26 [2021-11-20 07:24:36,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:24:36,233 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-11-20 07:24:36,233 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 07:24:36,233 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-11-20 07:24:36,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-20 07:24:36,234 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:24:36,235 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:24:36,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 07:24:36,235 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:24:36,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:24:36,236 INFO L85 PathProgramCache]: Analyzing trace with hash -2047649194, now seen corresponding path program 1 times [2021-11-20 07:24:36,236 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:24:36,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214685548] [2021-11-20 07:24:36,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:24:36,237 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:24:36,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:36,341 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-11-20 07:24:36,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:36,360 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-11-20 07:24:36,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:36,493 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-20 07:24:36,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:36,515 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 07:24:36,516 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:24:36,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1214685548] [2021-11-20 07:24:36,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1214685548] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 07:24:36,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1685480494] [2021-11-20 07:24:36,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:24:36,517 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:24:36,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:24:36,523 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:24:36,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 07:24:36,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:36,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-20 07:24:36,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:24:36,844 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 07:24:36,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:24:37,043 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 07:24:37,043 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1685480494] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 07:24:37,043 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 07:24:37,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 11 [2021-11-20 07:24:37,044 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453095692] [2021-11-20 07:24:37,044 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 07:24:37,046 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-20 07:24:37,046 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:24:37,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-20 07:24:37,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2021-11-20 07:24:37,049 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (7), 3 states have call predecessors, (7), 5 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-20 07:24:37,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:24:37,395 INFO L93 Difference]: Finished difference Result 66 states and 76 transitions. [2021-11-20 07:24:37,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-20 07:24:37,397 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (7), 3 states have call predecessors, (7), 5 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 27 [2021-11-20 07:24:37,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:24:37,399 INFO L225 Difference]: With dead ends: 66 [2021-11-20 07:24:37,399 INFO L226 Difference]: Without dead ends: 40 [2021-11-20 07:24:37,399 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2021-11-20 07:24:37,400 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 29 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 07:24:37,401 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 88 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 07:24:37,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-20 07:24:37,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-11-20 07:24:37,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 28 states have internal predecessors, (31), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-20 07:24:37,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2021-11-20 07:24:37,416 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 27 [2021-11-20 07:24:37,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:24:37,416 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2021-11-20 07:24:37,417 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (7), 3 states have call predecessors, (7), 5 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-20 07:24:37,417 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2021-11-20 07:24:37,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-20 07:24:37,418 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:24:37,418 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:24:37,449 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-20 07:24:37,646 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:24:37,647 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:24:37,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:24:37,647 INFO L85 PathProgramCache]: Analyzing trace with hash 571183018, now seen corresponding path program 2 times [2021-11-20 07:24:37,648 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:24:37,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1303388669] [2021-11-20 07:24:37,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:24:37,648 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:24:37,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:37,721 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-11-20 07:24:37,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:37,737 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-11-20 07:24:37,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:38,015 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-20 07:24:38,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:38,038 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 07:24:38,039 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:24:38,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1303388669] [2021-11-20 07:24:38,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1303388669] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 07:24:38,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1976581128] [2021-11-20 07:24:38,040 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-20 07:24:38,040 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:24:38,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:24:38,041 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:24:38,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 07:24:38,158 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-20 07:24:38,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 07:24:38,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-20 07:24:38,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:24:38,219 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 14 treesize of output 10 [2021-11-20 07:24:38,264 INFO L354 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2021-11-20 07:24:38,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 07:24:38,332 INFO L354 Elim1Store]: treesize reduction 76, result has 21.6 percent of original size [2021-11-20 07:24:38,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 37 [2021-11-20 07:24:38,422 INFO L354 Elim1Store]: treesize reduction 129, result has 19.4 percent of original size [2021-11-20 07:24:38,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 50 treesize of output 55 [2021-11-20 07:24:41,436 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 07:24:41,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:24:41,954 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 27 treesize of output 25 [2021-11-20 07:24:42,220 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 32 treesize of output 30 [2021-11-20 07:24:42,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 306 treesize of output 304 [2021-11-20 07:24:42,346 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 07:24:42,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1976581128] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 07:24:42,346 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 07:24:42,347 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12, 11] total 27 [2021-11-20 07:24:42,347 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482859641] [2021-11-20 07:24:42,347 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 07:24:42,348 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-20 07:24:42,348 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:24:42,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-20 07:24:42,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=610, Unknown=1, NotChecked=0, Total=702 [2021-11-20 07:24:42,350 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand has 27 states, 27 states have (on average 1.7777777777777777) internal successors, (48), 25 states have internal predecessors, (48), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-20 07:24:43,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:24:43,279 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2021-11-20 07:24:43,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-20 07:24:43,280 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.7777777777777777) internal successors, (48), 25 states have internal predecessors, (48), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 30 [2021-11-20 07:24:43,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:24:43,283 INFO L225 Difference]: With dead ends: 73 [2021-11-20 07:24:43,283 INFO L226 Difference]: Without dead ends: 49 [2021-11-20 07:24:43,284 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=160, Invalid=1099, Unknown=1, NotChecked=0, Total=1260 [2021-11-20 07:24:43,285 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 30 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 92 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 07:24:43,286 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 199 Invalid, 445 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 336 Invalid, 0 Unknown, 92 Unchecked, 0.5s Time] [2021-11-20 07:24:43,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-20 07:24:43,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 45. [2021-11-20 07:24:43,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 31 states have (on average 1.1935483870967742) internal successors, (37), 33 states have internal predecessors, (37), 7 states have call successors, (7), 5 states have call predecessors, (7), 6 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-20 07:24:43,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 51 transitions. [2021-11-20 07:24:43,307 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 51 transitions. Word has length 30 [2021-11-20 07:24:43,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:24:43,307 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 51 transitions. [2021-11-20 07:24:43,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.7777777777777777) internal successors, (48), 25 states have internal predecessors, (48), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-20 07:24:43,308 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 51 transitions. [2021-11-20 07:24:43,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-20 07:24:43,309 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:24:43,309 INFO L514 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:24:43,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 07:24:43,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:24:43,526 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:24:43,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:24:43,526 INFO L85 PathProgramCache]: Analyzing trace with hash -1096813473, now seen corresponding path program 1 times [2021-11-20 07:24:43,526 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:24:43,527 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889368600] [2021-11-20 07:24:43,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:24:43,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:24:43,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:43,600 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-11-20 07:24:43,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:43,635 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-11-20 07:24:43,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:43,660 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-20 07:24:43,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:43,696 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-20 07:24:43,696 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:24:43,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889368600] [2021-11-20 07:24:43,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1889368600] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 07:24:43,697 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 07:24:43,697 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-20 07:24:43,697 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741313158] [2021-11-20 07:24:43,697 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 07:24:43,698 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 07:24:43,698 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:24:43,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 07:24:43,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-20 07:24:43,699 INFO L87 Difference]: Start difference. First operand 45 states and 51 transitions. Second operand has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-20 07:24:43,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:24:43,837 INFO L93 Difference]: Finished difference Result 55 states and 62 transitions. [2021-11-20 07:24:43,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-20 07:24:43,838 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 31 [2021-11-20 07:24:43,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:24:43,841 INFO L225 Difference]: With dead ends: 55 [2021-11-20 07:24:43,841 INFO L226 Difference]: Without dead ends: 53 [2021-11-20 07:24:43,841 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-20 07:24:43,844 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 26 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 07:24:43,845 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 134 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 07:24:43,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-20 07:24:43,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2021-11-20 07:24:43,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 38 states have internal predecessors, (41), 8 states have call successors, (8), 6 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-20 07:24:43,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 59 transitions. [2021-11-20 07:24:43,863 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 59 transitions. Word has length 31 [2021-11-20 07:24:43,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:24:43,864 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 59 transitions. [2021-11-20 07:24:43,867 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-20 07:24:43,868 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 59 transitions. [2021-11-20 07:24:43,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-20 07:24:43,870 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:24:43,870 INFO L514 BasicCegarLoop]: trace histogram [5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:24:43,871 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-20 07:24:43,871 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:24:43,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:24:43,872 INFO L85 PathProgramCache]: Analyzing trace with hash -221402772, now seen corresponding path program 1 times [2021-11-20 07:24:43,872 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:24:43,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1936175144] [2021-11-20 07:24:43,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:24:43,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:24:43,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:43,989 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-11-20 07:24:43,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:44,007 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-11-20 07:24:44,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:44,220 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-20 07:24:44,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:44,237 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 07:24:44,237 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:24:44,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1936175144] [2021-11-20 07:24:44,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1936175144] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 07:24:44,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [399445996] [2021-11-20 07:24:44,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:24:44,239 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:24:44,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:24:44,240 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:24:44,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 07:24:44,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:24:44,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-20 07:24:44,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:24:44,447 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 14 treesize of output 10 [2021-11-20 07:24:44,496 INFO L354 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2021-11-20 07:24:44,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 07:24:44,555 INFO L354 Elim1Store]: treesize reduction 72, result has 22.6 percent of original size [2021-11-20 07:24:44,556 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 45 treesize of output 47 [2021-11-20 07:24:44,669 INFO L354 Elim1Store]: treesize reduction 124, result has 19.5 percent of original size [2021-11-20 07:24:44,669 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 59 treesize of output 64 [2021-11-20 07:24:44,847 INFO L354 Elim1Store]: treesize reduction 188, result has 17.2 percent of original size [2021-11-20 07:24:44,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 68 treesize of output 76 [2021-11-20 07:24:53,271 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 07:24:53,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:24:54,555 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 28 treesize of output 26 [2021-11-20 07:24:54,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 180 treesize of output 176 [2021-11-20 07:24:54,675 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-20 07:24:54,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [399445996] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 07:24:54,675 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 07:24:54,675 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14, 11] total 30 [2021-11-20 07:24:54,675 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979889910] [2021-11-20 07:24:54,675 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 07:24:54,676 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-20 07:24:54,676 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:24:54,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-20 07:24:54,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=767, Unknown=3, NotChecked=0, Total=870 [2021-11-20 07:24:54,677 INFO L87 Difference]: Start difference. First operand 52 states and 59 transitions. Second operand has 30 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 28 states have internal predecessors, (58), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-20 07:25:09,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:25:09,551 INFO L93 Difference]: Finished difference Result 103 states and 122 transitions. [2021-11-20 07:25:09,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-20 07:25:09,552 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 28 states have internal predecessors, (58), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 34 [2021-11-20 07:25:09,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:25:09,554 INFO L225 Difference]: With dead ends: 103 [2021-11-20 07:25:09,554 INFO L226 Difference]: Without dead ends: 64 [2021-11-20 07:25:09,555 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 49 SyntacticMatches, 3 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 22.0s TimeCoverageRelationStatistics Valid=168, Invalid=1307, Unknown=7, NotChecked=0, Total=1482 [2021-11-20 07:25:09,556 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 26 mSDsluCounter, 336 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 128 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 07:25:09,556 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 370 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 260 Invalid, 0 Unknown, 128 Unchecked, 0.3s Time] [2021-11-20 07:25:09,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-20 07:25:09,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2021-11-20 07:25:09,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 45 states have (on average 1.2222222222222223) internal successors, (55), 47 states have internal predecessors, (55), 8 states have call successors, (8), 7 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-20 07:25:09,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 73 transitions. [2021-11-20 07:25:09,568 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 73 transitions. Word has length 34 [2021-11-20 07:25:09,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:25:09,569 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 73 transitions. [2021-11-20 07:25:09,569 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 28 states have internal predecessors, (58), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-20 07:25:09,569 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 73 transitions. [2021-11-20 07:25:09,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-20 07:25:09,570 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:25:09,570 INFO L514 BasicCegarLoop]: trace histogram [6, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:25:09,600 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 07:25:09,794 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:25:09,795 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:25:09,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:25:09,795 INFO L85 PathProgramCache]: Analyzing trace with hash 1297389162, now seen corresponding path program 2 times [2021-11-20 07:25:09,795 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:25:09,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [442441869] [2021-11-20 07:25:09,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:25:09,796 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:25:09,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:25:09,877 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-11-20 07:25:09,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:25:09,896 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-11-20 07:25:09,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:25:10,113 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-11-20 07:25:10,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:25:10,130 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-20 07:25:10,131 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:25:10,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [442441869] [2021-11-20 07:25:10,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [442441869] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 07:25:10,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1277945827] [2021-11-20 07:25:10,131 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-20 07:25:10,131 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:25:10,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:25:10,133 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:25:10,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 07:25:10,374 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-20 07:25:10,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 07:25:10,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-20 07:25:10,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:25:10,447 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 25 treesize of output 21 [2021-11-20 07:25:10,509 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-20 07:25:10,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 38 [2021-11-20 07:25:10,634 INFO L354 Elim1Store]: treesize reduction 64, result has 22.9 percent of original size [2021-11-20 07:25:10,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 53 treesize of output 55 [2021-11-20 07:25:10,809 INFO L354 Elim1Store]: treesize reduction 114, result has 19.7 percent of original size [2021-11-20 07:25:10,809 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 62 treesize of output 67 [2021-11-20 07:25:19,625 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 3 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 07:25:19,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:25:20,600 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 45 treesize of output 43 [2021-11-20 07:25:20,961 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 27 treesize of output 25 [2021-11-20 07:25:20,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 79 [2021-11-20 07:25:21,161 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 3 proven. 22 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-20 07:25:21,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1277945827] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 07:25:21,161 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 07:25:21,161 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16, 13] total 35 [2021-11-20 07:25:21,162 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723254884] [2021-11-20 07:25:21,162 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 07:25:21,162 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-20 07:25:21,162 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:25:21,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-20 07:25:21,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1074, Unknown=3, NotChecked=0, Total=1190 [2021-11-20 07:25:21,164 INFO L87 Difference]: Start difference. First operand 62 states and 73 transitions. Second operand has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 33 states have internal predecessors, (67), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-20 07:25:36,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:25:36,263 INFO L93 Difference]: Finished difference Result 118 states and 144 transitions. [2021-11-20 07:25:36,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-20 07:25:36,264 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 33 states have internal predecessors, (67), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 38 [2021-11-20 07:25:36,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:25:36,265 INFO L225 Difference]: With dead ends: 118 [2021-11-20 07:25:36,265 INFO L226 Difference]: Without dead ends: 72 [2021-11-20 07:25:36,266 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 53 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 358 ImplicationChecksByTransitivity, 22.3s TimeCoverageRelationStatistics Valid=184, Invalid=1789, Unknown=7, NotChecked=0, Total=1980 [2021-11-20 07:25:36,267 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 24 mSDsluCounter, 319 mSDsCounter, 0 mSdLazyCounter, 303 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 352 SdHoareTripleChecker+Invalid, 378 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 63 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 07:25:36,268 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 352 Invalid, 378 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 303 Invalid, 0 Unknown, 63 Unchecked, 0.3s Time] [2021-11-20 07:25:36,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-20 07:25:36,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 69. [2021-11-20 07:25:36,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 52 states have (on average 1.25) internal successors, (65), 54 states have internal predecessors, (65), 8 states have call successors, (8), 7 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-20 07:25:36,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 83 transitions. [2021-11-20 07:25:36,280 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 83 transitions. Word has length 38 [2021-11-20 07:25:36,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:25:36,280 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 83 transitions. [2021-11-20 07:25:36,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 33 states have internal predecessors, (67), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-20 07:25:36,281 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 83 transitions. [2021-11-20 07:25:36,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-20 07:25:36,282 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:25:36,282 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:25:36,305 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-20 07:25:36,486 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:25:36,487 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:25:36,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:25:36,487 INFO L85 PathProgramCache]: Analyzing trace with hash -722331988, now seen corresponding path program 3 times [2021-11-20 07:25:36,487 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:25:36,487 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [721512048] [2021-11-20 07:25:36,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:25:36,487 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:25:36,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:25:36,580 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-11-20 07:25:36,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:25:36,594 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-11-20 07:25:36,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:25:36,875 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-11-20 07:25:36,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:25:36,892 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-20 07:25:36,892 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:25:36,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [721512048] [2021-11-20 07:25:36,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [721512048] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 07:25:36,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [654366665] [2021-11-20 07:25:36,893 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 07:25:36,893 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:25:36,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:25:36,894 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:25:36,913 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 07:25:37,268 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-20 07:25:37,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 07:25:37,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-20 07:25:37,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:25:37,303 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 14 treesize of output 10 [2021-11-20 07:25:37,338 INFO L354 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2021-11-20 07:25:37,339 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 07:25:37,395 INFO L354 Elim1Store]: treesize reduction 76, result has 21.6 percent of original size [2021-11-20 07:25:37,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 37 [2021-11-20 07:25:37,476 INFO L354 Elim1Store]: treesize reduction 135, result has 18.7 percent of original size [2021-11-20 07:25:37,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 50 [2021-11-20 07:25:37,572 INFO L354 Elim1Store]: treesize reduction 208, result has 16.5 percent of original size [2021-11-20 07:25:37,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 55 treesize of output 63 [2021-11-20 07:25:37,707 INFO L354 Elim1Store]: treesize reduction 295, result has 14.7 percent of original size [2021-11-20 07:25:37,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 65 treesize of output 76 [2021-11-20 07:25:37,858 INFO L354 Elim1Store]: treesize reduction 396, result has 13.3 percent of original size [2021-11-20 07:25:37,859 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 107 treesize of output 86 [2021-11-20 07:25:38,266 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-20 07:25:38,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:25:38,510 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [654366665] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 07:25:38,511 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 07:25:38,511 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 20 [2021-11-20 07:25:38,511 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141737207] [2021-11-20 07:25:38,511 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 07:25:38,512 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-20 07:25:38,512 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:25:38,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-20 07:25:38,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=375, Unknown=0, NotChecked=0, Total=420 [2021-11-20 07:25:38,513 INFO L87 Difference]: Start difference. First operand 69 states and 83 transitions. Second operand has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 states have internal predecessors, (43), 2 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-20 07:25:39,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:25:39,604 INFO L93 Difference]: Finished difference Result 120 states and 148 transitions. [2021-11-20 07:25:39,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-20 07:25:39,604 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 states have internal predecessors, (43), 2 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 42 [2021-11-20 07:25:39,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:25:39,605 INFO L225 Difference]: With dead ends: 120 [2021-11-20 07:25:39,605 INFO L226 Difference]: Without dead ends: 70 [2021-11-20 07:25:39,606 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=95, Invalid=835, Unknown=0, NotChecked=0, Total=930 [2021-11-20 07:25:39,609 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 20 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 385 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 430 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 385 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 07:25:39,609 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 220 Invalid, 430 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 385 Invalid, 0 Unknown, 33 Unchecked, 0.6s Time] [2021-11-20 07:25:39,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-20 07:25:39,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-11-20 07:25:39,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 53 states have (on average 1.2452830188679245) internal successors, (66), 55 states have internal predecessors, (66), 8 states have call successors, (8), 7 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-20 07:25:39,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-20 07:25:39,623 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 42 [2021-11-20 07:25:39,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:25:39,624 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-20 07:25:39,624 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 states have internal predecessors, (43), 2 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-20 07:25:39,624 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-20 07:25:39,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-20 07:25:39,625 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:25:39,626 INFO L514 BasicCegarLoop]: trace histogram [8, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:25:39,652 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 07:25:39,838 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:25:39,839 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:25:39,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:25:39,839 INFO L85 PathProgramCache]: Analyzing trace with hash 877597784, now seen corresponding path program 4 times [2021-11-20 07:25:39,839 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:25:39,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437170089] [2021-11-20 07:25:39,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:25:39,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:25:39,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:25:39,917 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-11-20 07:25:39,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:25:39,936 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-11-20 07:25:39,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:25:40,192 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-11-20 07:25:40,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:25:40,218 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-20 07:25:40,218 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:25:40,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437170089] [2021-11-20 07:25:40,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [437170089] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 07:25:40,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [430507022] [2021-11-20 07:25:40,219 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 07:25:40,219 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:25:40,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:25:40,220 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:25:40,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 07:25:40,679 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 07:25:40,679 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 07:25:40,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-20 07:25:40,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:25:40,790 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 14 treesize of output 10 [2021-11-20 07:25:40,834 INFO L354 Elim1Store]: treesize reduction 30, result has 25.0 percent of original size [2021-11-20 07:25:40,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-20 07:25:40,919 INFO L354 Elim1Store]: treesize reduction 68, result has 22.7 percent of original size [2021-11-20 07:25:40,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 49 treesize of output 51 [2021-11-20 07:25:41,067 INFO L354 Elim1Store]: treesize reduction 119, result has 19.6 percent of original size [2021-11-20 07:25:41,067 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 63 treesize of output 68 [2021-11-20 07:25:41,266 INFO L354 Elim1Store]: treesize reduction 182, result has 17.3 percent of original size [2021-11-20 07:25:41,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 72 treesize of output 80 [2021-11-20 07:25:52,633 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 3 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 07:25:52,634 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:25:54,414 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 22 treesize of output 20 [2021-11-20 07:25:54,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 76 [2021-11-20 07:25:54,636 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 41 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 07:25:54,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [430507022] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 07:25:54,637 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 07:25:54,637 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19, 15] total 42 [2021-11-20 07:25:54,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082654861] [2021-11-20 07:25:54,637 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 07:25:54,638 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-20 07:25:54,638 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:25:54,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-20 07:25:54,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=1576, Unknown=4, NotChecked=0, Total=1722 [2021-11-20 07:25:54,639 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 42 states, 42 states have (on average 1.8571428571428572) internal successors, (78), 40 states have internal predecessors, (78), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-20 07:26:11,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:26:11,796 INFO L93 Difference]: Finished difference Result 131 states and 163 transitions. [2021-11-20 07:26:11,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-20 07:26:11,797 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.8571428571428572) internal successors, (78), 40 states have internal predecessors, (78), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 43 [2021-11-20 07:26:11,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:26:11,798 INFO L225 Difference]: With dead ends: 131 [2021-11-20 07:26:11,798 INFO L226 Difference]: Without dead ends: 79 [2021-11-20 07:26:11,799 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 57 SyntacticMatches, 4 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 478 ImplicationChecksByTransitivity, 26.9s TimeCoverageRelationStatistics Valid=217, Invalid=2426, Unknown=9, NotChecked=0, Total=2652 [2021-11-20 07:26:11,800 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 27 mSDsluCounter, 365 mSDsCounter, 0 mSdLazyCounter, 330 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 399 SdHoareTripleChecker+Invalid, 457 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 114 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 07:26:11,800 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 399 Invalid, 457 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 330 Invalid, 0 Unknown, 114 Unchecked, 0.3s Time] [2021-11-20 07:26:11,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-20 07:26:11,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 77. [2021-11-20 07:26:11,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 60 states have (on average 1.2666666666666666) internal successors, (76), 62 states have internal predecessors, (76), 8 states have call successors, (8), 7 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-20 07:26:11,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 94 transitions. [2021-11-20 07:26:11,815 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 94 transitions. Word has length 43 [2021-11-20 07:26:11,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:26:11,816 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 94 transitions. [2021-11-20 07:26:11,816 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.8571428571428572) internal successors, (78), 40 states have internal predecessors, (78), 4 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-20 07:26:11,816 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 94 transitions. [2021-11-20 07:26:11,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-20 07:26:11,818 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:26:11,818 INFO L514 BasicCegarLoop]: trace histogram [9, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:26:11,853 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 07:26:12,039 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:26:12,040 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:26:12,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:26:12,040 INFO L85 PathProgramCache]: Analyzing trace with hash -980527914, now seen corresponding path program 5 times [2021-11-20 07:26:12,041 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:26:12,041 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [678305487] [2021-11-20 07:26:12,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:26:12,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:26:12,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:12,125 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-11-20 07:26:12,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:12,141 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-11-20 07:26:12,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:12,447 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-11-20 07:26:12,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:12,463 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-20 07:26:12,463 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:26:12,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [678305487] [2021-11-20 07:26:12,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [678305487] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 07:26:12,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355358218] [2021-11-20 07:26:12,464 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-20 07:26:12,464 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:26:12,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:26:12,467 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:26:12,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 07:26:17,162 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-20 07:26:17,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 07:26:17,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-20 07:26:17,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:26:17,256 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 14 treesize of output 10 [2021-11-20 07:26:17,305 INFO L354 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2021-11-20 07:26:17,305 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 07:26:17,374 INFO L354 Elim1Store]: treesize reduction 76, result has 21.6 percent of original size [2021-11-20 07:26:17,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 37 [2021-11-20 07:26:17,468 INFO L354 Elim1Store]: treesize reduction 135, result has 18.7 percent of original size [2021-11-20 07:26:17,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 50 [2021-11-20 07:26:17,571 INFO L354 Elim1Store]: treesize reduction 208, result has 16.5 percent of original size [2021-11-20 07:26:17,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 55 treesize of output 63 [2021-11-20 07:26:17,738 INFO L354 Elim1Store]: treesize reduction 295, result has 14.7 percent of original size [2021-11-20 07:26:17,738 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 65 treesize of output 76 [2021-11-20 07:26:17,932 INFO L354 Elim1Store]: treesize reduction 396, result has 13.3 percent of original size [2021-11-20 07:26:17,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 75 treesize of output 89 [2021-11-20 07:26:18,151 INFO L354 Elim1Store]: treesize reduction 511, result has 12.2 percent of original size [2021-11-20 07:26:18,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 28 case distinctions, treesize of input 85 treesize of output 102 [2021-11-20 07:26:18,412 INFO L354 Elim1Store]: treesize reduction 928, result has 10.2 percent of original size [2021-11-20 07:26:18,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 36 case distinctions, treesize of input 147 treesize of output 167 [2021-11-20 07:26:23,333 WARN L322 ript$VariableManager]: TermVariabe |aux_div_v_#Ultimate.C_memset_#t~loopctr676_140_92| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-11-20 07:26:23,334 WARN L322 ript$VariableManager]: TermVariabe |aux_mod_v_#Ultimate.C_memset_#t~loopctr676_140_92| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-11-20 07:26:23,403 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 07:26:23,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:26:27,552 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 107 treesize of output 103 [2021-11-20 07:26:29,537 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 127 treesize of output 123 [2021-11-20 07:26:29,556 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-11-20 07:26:29,557 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23007 treesize of output 23001 [2021-11-20 07:26:30,289 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 20 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 07:26:30,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [355358218] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 07:26:30,290 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 07:26:30,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 26, 22] total 57 [2021-11-20 07:26:30,291 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848331348] [2021-11-20 07:26:30,291 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 07:26:30,291 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-20 07:26:30,291 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:26:30,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-20 07:26:30,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=320, Invalid=2872, Unknown=0, NotChecked=0, Total=3192 [2021-11-20 07:26:30,294 INFO L87 Difference]: Start difference. First operand 77 states and 94 transitions. Second operand has 57 states, 55 states have (on average 1.6545454545454545) internal successors, (91), 54 states have internal predecessors, (91), 6 states have call successors, (11), 5 states have call predecessors, (11), 6 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-20 07:26:35,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:26:35,611 INFO L93 Difference]: Finished difference Result 161 states and 203 transitions. [2021-11-20 07:26:35,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-20 07:26:35,616 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 55 states have (on average 1.6545454545454545) internal successors, (91), 54 states have internal predecessors, (91), 6 states have call successors, (11), 5 states have call predecessors, (11), 6 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 47 [2021-11-20 07:26:35,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:26:35,617 INFO L225 Difference]: With dead ends: 161 [2021-11-20 07:26:35,617 INFO L226 Difference]: Without dead ends: 105 [2021-11-20 07:26:35,619 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1157 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=450, Invalid=4806, Unknown=0, NotChecked=0, Total=5256 [2021-11-20 07:26:35,619 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 76 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 1769 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 2015 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 1769 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 175 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2021-11-20 07:26:35,620 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 288 Invalid, 2015 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 1769 Invalid, 0 Unknown, 175 Unchecked, 3.7s Time] [2021-11-20 07:26:35,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-20 07:26:35,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 81. [2021-11-20 07:26:35,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 64 states have (on average 1.28125) internal successors, (82), 66 states have internal predecessors, (82), 8 states have call successors, (8), 7 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-20 07:26:35,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 100 transitions. [2021-11-20 07:26:35,639 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 100 transitions. Word has length 47 [2021-11-20 07:26:35,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:26:35,640 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 100 transitions. [2021-11-20 07:26:35,640 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 55 states have (on average 1.6545454545454545) internal successors, (91), 54 states have internal predecessors, (91), 6 states have call successors, (11), 5 states have call predecessors, (11), 6 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-20 07:26:35,640 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 100 transitions. [2021-11-20 07:26:35,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-20 07:26:35,642 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:26:35,642 INFO L514 BasicCegarLoop]: trace histogram [10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:26:35,651 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 07:26:35,848 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-20 07:26:35,848 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:26:35,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:26:35,849 INFO L85 PathProgramCache]: Analyzing trace with hash -895601288, now seen corresponding path program 1 times [2021-11-20 07:26:35,849 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:26:35,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [357260803] [2021-11-20 07:26:35,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:26:35,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:26:35,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:35,935 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-20 07:26:35,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:36,016 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-20 07:26:36,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:36,024 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-20 07:26:36,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:36,357 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-11-20 07:26:36,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:36,370 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-11-20 07:26:36,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:36,380 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-11-20 07:26:36,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:36,390 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 2 proven. 55 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 07:26:36,390 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:26:36,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [357260803] [2021-11-20 07:26:36,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [357260803] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 07:26:36,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [460570286] [2021-11-20 07:26:36,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:26:36,391 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:26:36,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:26:36,398 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:26:36,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 07:26:36,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:36,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-20 07:26:36,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:26:36,687 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-20 07:26:36,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:26:36,907 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-20 07:26:36,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [460570286] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 07:26:36,908 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 07:26:36,908 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 6, 4] total 20 [2021-11-20 07:26:36,908 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64307998] [2021-11-20 07:26:36,908 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 07:26:36,909 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-20 07:26:36,909 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:26:36,909 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-20 07:26:36,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=321, Unknown=0, NotChecked=0, Total=380 [2021-11-20 07:26:36,910 INFO L87 Difference]: Start difference. First operand 81 states and 100 transitions. Second operand has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 2 states have call successors, (12), 3 states have call predecessors, (12), 6 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-20 07:26:37,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:26:37,486 INFO L93 Difference]: Finished difference Result 149 states and 189 transitions. [2021-11-20 07:26:37,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-20 07:26:37,487 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 2 states have call successors, (12), 3 states have call predecessors, (12), 6 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 50 [2021-11-20 07:26:37,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:26:37,488 INFO L225 Difference]: With dead ends: 149 [2021-11-20 07:26:37,488 INFO L226 Difference]: Without dead ends: 84 [2021-11-20 07:26:37,489 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 107 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=116, Invalid=640, Unknown=0, NotChecked=0, Total=756 [2021-11-20 07:26:37,489 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 48 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 381 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 403 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 07:26:37,490 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 199 Invalid, 403 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 381 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 07:26:37,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-20 07:26:37,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 82. [2021-11-20 07:26:37,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 65 states have (on average 1.2153846153846153) internal successors, (79), 67 states have internal predecessors, (79), 8 states have call successors, (8), 7 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-20 07:26:37,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 97 transitions. [2021-11-20 07:26:37,508 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 97 transitions. Word has length 50 [2021-11-20 07:26:37,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:26:37,509 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 97 transitions. [2021-11-20 07:26:37,509 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 2 states have call successors, (12), 3 states have call predecessors, (12), 6 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-20 07:26:37,509 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 97 transitions. [2021-11-20 07:26:37,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-20 07:26:37,510 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:26:37,511 INFO L514 BasicCegarLoop]: trace histogram [11, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:26:37,533 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-20 07:26:37,718 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-20 07:26:37,719 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:26:37,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:26:37,719 INFO L85 PathProgramCache]: Analyzing trace with hash 1854163308, now seen corresponding path program 6 times [2021-11-20 07:26:37,719 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:26:37,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2667097] [2021-11-20 07:26:37,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:26:37,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:26:37,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:37,817 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-11-20 07:26:37,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:37,833 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-11-20 07:26:37,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:38,259 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-11-20 07:26:38,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:38,288 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-20 07:26:38,288 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:26:38,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2667097] [2021-11-20 07:26:38,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2667097] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 07:26:38,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1867841738] [2021-11-20 07:26:38,289 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-20 07:26:38,289 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:26:38,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:26:38,303 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:26:38,305 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 07:26:40,536 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-20 07:26:40,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 07:26:40,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 66 conjunts are in the unsatisfiable core [2021-11-20 07:26:40,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:26:40,566 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 14 treesize of output 10 [2021-11-20 07:26:40,603 INFO L354 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2021-11-20 07:26:40,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 07:26:40,662 INFO L354 Elim1Store]: treesize reduction 76, result has 21.6 percent of original size [2021-11-20 07:26:40,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 37 [2021-11-20 07:26:40,739 INFO L354 Elim1Store]: treesize reduction 135, result has 18.7 percent of original size [2021-11-20 07:26:40,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 50 [2021-11-20 07:26:40,824 INFO L354 Elim1Store]: treesize reduction 208, result has 16.5 percent of original size [2021-11-20 07:26:40,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 55 treesize of output 63 [2021-11-20 07:26:40,951 INFO L354 Elim1Store]: treesize reduction 295, result has 14.7 percent of original size [2021-11-20 07:26:40,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 65 treesize of output 76 [2021-11-20 07:26:41,083 INFO L354 Elim1Store]: treesize reduction 396, result has 13.3 percent of original size [2021-11-20 07:26:41,084 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 75 treesize of output 89 [2021-11-20 07:26:41,251 INFO L354 Elim1Store]: treesize reduction 511, result has 12.2 percent of original size [2021-11-20 07:26:41,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 28 case distinctions, treesize of input 85 treesize of output 102 [2021-11-20 07:26:41,459 INFO L354 Elim1Store]: treesize reduction 640, result has 11.2 percent of original size [2021-11-20 07:26:41,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 36 case distinctions, treesize of input 95 treesize of output 115 [2021-11-20 07:26:41,717 INFO L354 Elim1Store]: treesize reduction 783, result has 10.4 percent of original size [2021-11-20 07:26:41,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 45 case distinctions, treesize of input 105 treesize of output 128 [2021-11-20 07:26:42,046 INFO L354 Elim1Store]: treesize reduction 940, result has 9.7 percent of original size [2021-11-20 07:26:42,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 55 case distinctions, treesize of input 115 treesize of output 141 [2021-11-20 07:26:42,578 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-20 07:26:42,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:26:42,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1867841738] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 07:26:42,783 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 07:26:42,783 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 28 [2021-11-20 07:26:42,783 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652268366] [2021-11-20 07:26:42,783 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 07:26:42,783 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-20 07:26:42,784 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:26:42,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-20 07:26:42,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=747, Unknown=0, NotChecked=0, Total=812 [2021-11-20 07:26:42,784 INFO L87 Difference]: Start difference. First operand 82 states and 97 transitions. Second operand has 28 states, 28 states have (on average 1.8214285714285714) internal successors, (51), 27 states have internal predecessors, (51), 2 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-20 07:26:44,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:26:44,744 INFO L93 Difference]: Finished difference Result 142 states and 172 transitions. [2021-11-20 07:26:44,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-20 07:26:44,745 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.8214285714285714) internal successors, (51), 27 states have internal predecessors, (51), 2 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 52 [2021-11-20 07:26:44,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:26:44,746 INFO L225 Difference]: With dead ends: 142 [2021-11-20 07:26:44,746 INFO L226 Difference]: Without dead ends: 83 [2021-11-20 07:26:44,747 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=135, Invalid=1671, Unknown=0, NotChecked=0, Total=1806 [2021-11-20 07:26:44,747 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 20 mSDsluCounter, 399 mSDsCounter, 0 mSdLazyCounter, 821 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 434 SdHoareTripleChecker+Invalid, 874 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 821 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 37 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-20 07:26:44,747 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 434 Invalid, 874 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 821 Invalid, 0 Unknown, 37 Unchecked, 1.2s Time] [2021-11-20 07:26:44,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-20 07:26:44,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-11-20 07:26:44,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 66 states have (on average 1.2121212121212122) internal successors, (80), 68 states have internal predecessors, (80), 8 states have call successors, (8), 7 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-20 07:26:44,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 98 transitions. [2021-11-20 07:26:44,768 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 98 transitions. Word has length 52 [2021-11-20 07:26:44,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:26:44,768 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 98 transitions. [2021-11-20 07:26:44,768 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.8214285714285714) internal successors, (51), 27 states have internal predecessors, (51), 2 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-20 07:26:44,768 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 98 transitions. [2021-11-20 07:26:44,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-20 07:26:44,769 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:26:44,769 INFO L514 BasicCegarLoop]: trace histogram [12, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:26:44,780 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-20 07:26:44,974 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-20 07:26:44,975 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:26:44,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:26:44,975 INFO L85 PathProgramCache]: Analyzing trace with hash 1496391704, now seen corresponding path program 7 times [2021-11-20 07:26:44,976 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:26:44,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1372231523] [2021-11-20 07:26:44,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:26:44,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:26:45,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:45,067 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-11-20 07:26:45,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:45,085 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-11-20 07:26:45,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:45,501 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-11-20 07:26:45,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:45,518 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-20 07:26:45,518 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:26:45,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1372231523] [2021-11-20 07:26:45,519 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1372231523] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 07:26:45,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1320052132] [2021-11-20 07:26:45,519 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 07:26:45,519 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:26:45,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:26:45,523 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:26:45,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 07:26:46,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:26:46,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 86 conjunts are in the unsatisfiable core [2021-11-20 07:26:46,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:26:46,466 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 14 treesize of output 10 [2021-11-20 07:26:46,518 INFO L354 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2021-11-20 07:26:46,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 07:26:46,592 INFO L354 Elim1Store]: treesize reduction 76, result has 21.6 percent of original size [2021-11-20 07:26:46,593 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 37 [2021-11-20 07:26:46,682 INFO L354 Elim1Store]: treesize reduction 135, result has 18.7 percent of original size [2021-11-20 07:26:46,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 50 [2021-11-20 07:26:46,789 INFO L354 Elim1Store]: treesize reduction 208, result has 16.5 percent of original size [2021-11-20 07:26:46,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 55 treesize of output 63 [2021-11-20 07:26:46,922 INFO L354 Elim1Store]: treesize reduction 295, result has 14.7 percent of original size [2021-11-20 07:26:46,923 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 65 treesize of output 76 [2021-11-20 07:26:47,084 INFO L354 Elim1Store]: treesize reduction 396, result has 13.3 percent of original size [2021-11-20 07:26:47,084 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 75 treesize of output 89 [2021-11-20 07:26:47,290 INFO L354 Elim1Store]: treesize reduction 511, result has 12.2 percent of original size [2021-11-20 07:26:47,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 28 case distinctions, treesize of input 85 treesize of output 102 [2021-11-20 07:26:47,526 INFO L354 Elim1Store]: treesize reduction 640, result has 11.2 percent of original size [2021-11-20 07:26:47,526 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 36 case distinctions, treesize of input 95 treesize of output 115 [2021-11-20 07:26:47,855 INFO L354 Elim1Store]: treesize reduction 783, result has 10.4 percent of original size [2021-11-20 07:26:47,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 45 case distinctions, treesize of input 105 treesize of output 128 [2021-11-20 07:26:48,225 INFO L354 Elim1Store]: treesize reduction 940, result has 9.7 percent of original size [2021-11-20 07:26:48,225 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 55 case distinctions, treesize of input 115 treesize of output 141 [2021-11-20 07:26:48,660 INFO L354 Elim1Store]: treesize reduction 1606, result has 8.2 percent of original size [2021-11-20 07:26:48,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 11 select indices, 11 select index equivalence classes, 0 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 66 case distinctions, treesize of input 186 treesize of output 215 [2021-11-20 07:26:56,500 WARN L322 ript$VariableManager]: TermVariabe |aux_div_v_#Ultimate.C_memset_#t~loopctr676_212_92| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-11-20 07:26:56,500 WARN L322 ript$VariableManager]: TermVariabe |aux_mod_v_#Ultimate.C_memset_#t~loopctr676_212_92| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-11-20 07:26:56,573 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 0 proven. 118 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 07:26:56,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:27:02,987 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 137 treesize of output 133 [2021-11-20 07:27:05,604 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 163 treesize of output 159 [2021-11-20 07:27:05,629 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-11-20 07:27:05,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 186333 treesize of output 186327 [2021-11-20 07:27:10,043 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 0 proven. 118 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 07:27:10,043 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1320052132] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 07:27:10,043 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 07:27:10,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 30, 26] total 68 [2021-11-20 07:27:10,044 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072852010] [2021-11-20 07:27:10,044 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 07:27:10,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-20 07:27:10,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 07:27:10,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-20 07:27:10,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=4137, Unknown=0, NotChecked=0, Total=4556 [2021-11-20 07:27:10,046 INFO L87 Difference]: Start difference. First operand 83 states and 98 transitions. Second operand has 68 states, 66 states have (on average 1.606060606060606) internal successors, (106), 65 states have internal predecessors, (106), 6 states have call successors, (11), 5 states have call predecessors, (11), 6 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-20 07:27:23,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 07:27:23,104 INFO L93 Difference]: Finished difference Result 163 states and 199 transitions. [2021-11-20 07:27:23,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-20 07:27:23,104 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 66 states have (on average 1.606060606060606) internal successors, (106), 65 states have internal predecessors, (106), 6 states have call successors, (11), 5 states have call predecessors, (11), 6 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 53 [2021-11-20 07:27:23,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 07:27:23,106 INFO L225 Difference]: With dead ends: 163 [2021-11-20 07:27:23,106 INFO L226 Difference]: Without dead ends: 104 [2021-11-20 07:27:23,108 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1633 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=589, Invalid=6721, Unknown=0, NotChecked=0, Total=7310 [2021-11-20 07:27:23,109 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 55 mSDsluCounter, 379 mSDsCounter, 0 mSdLazyCounter, 1803 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 418 SdHoareTripleChecker+Invalid, 2303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 1803 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 448 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2021-11-20 07:27:23,110 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 418 Invalid, 2303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 1803 Invalid, 0 Unknown, 448 Unchecked, 3.8s Time] [2021-11-20 07:27:23,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-11-20 07:27:23,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 87. [2021-11-20 07:27:23,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 70 states have (on average 1.2285714285714286) internal successors, (86), 72 states have internal predecessors, (86), 8 states have call successors, (8), 7 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-20 07:27:23,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 104 transitions. [2021-11-20 07:27:23,128 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 104 transitions. Word has length 53 [2021-11-20 07:27:23,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 07:27:23,129 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 104 transitions. [2021-11-20 07:27:23,129 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 66 states have (on average 1.606060606060606) internal successors, (106), 65 states have internal predecessors, (106), 6 states have call successors, (11), 5 states have call predecessors, (11), 6 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-20 07:27:23,129 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 104 transitions. [2021-11-20 07:27:23,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-20 07:27:23,131 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 07:27:23,131 INFO L514 BasicCegarLoop]: trace histogram [13, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 07:27:23,153 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-20 07:27:23,332 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-20 07:27:23,332 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 07:27:23,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 07:27:23,333 INFO L85 PathProgramCache]: Analyzing trace with hash 545196566, now seen corresponding path program 8 times [2021-11-20 07:27:23,333 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 07:27:23,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1668663903] [2021-11-20 07:27:23,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 07:27:23,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 07:27:23,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:27:23,417 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-11-20 07:27:23,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:27:23,431 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-11-20 07:27:23,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:27:23,945 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-11-20 07:27:23,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 07:27:23,973 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-20 07:27:23,974 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 07:27:23,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1668663903] [2021-11-20 07:27:23,974 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1668663903] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 07:27:23,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1206381977] [2021-11-20 07:27:23,974 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-20 07:27:23,975 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 07:27:23,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 07:27:23,979 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 07:27:23,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49f55b7f-8170-4bdc-9620-a2ebc2ecc33a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 07:27:24,737 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-20 07:27:24,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 07:27:24,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 93 conjunts are in the unsatisfiable core [2021-11-20 07:27:24,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 07:27:24,828 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 14 treesize of output 10 [2021-11-20 07:27:24,884 INFO L354 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2021-11-20 07:27:24,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 07:27:24,957 INFO L354 Elim1Store]: treesize reduction 76, result has 21.6 percent of original size [2021-11-20 07:27:24,957 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 37 [2021-11-20 07:27:25,056 INFO L354 Elim1Store]: treesize reduction 135, result has 18.7 percent of original size [2021-11-20 07:27:25,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 50 [2021-11-20 07:27:25,175 INFO L354 Elim1Store]: treesize reduction 208, result has 16.5 percent of original size [2021-11-20 07:27:25,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 55 treesize of output 63 [2021-11-20 07:27:25,333 INFO L354 Elim1Store]: treesize reduction 295, result has 14.7 percent of original size [2021-11-20 07:27:25,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 65 treesize of output 76 [2021-11-20 07:27:25,511 INFO L354 Elim1Store]: treesize reduction 396, result has 13.3 percent of original size [2021-11-20 07:27:25,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 75 treesize of output 89 [2021-11-20 07:27:25,740 INFO L354 Elim1Store]: treesize reduction 511, result has 12.2 percent of original size [2021-11-20 07:27:25,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 28 case distinctions, treesize of input 85 treesize of output 102 [2021-11-20 07:27:26,001 INFO L354 Elim1Store]: treesize reduction 640, result has 11.2 percent of original size [2021-11-20 07:27:26,001 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 36 case distinctions, treesize of input 95 treesize of output 115 [2021-11-20 07:27:26,306 INFO L354 Elim1Store]: treesize reduction 783, result has 10.4 percent of original size [2021-11-20 07:27:26,307 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 45 case distinctions, treesize of input 105 treesize of output 128 [2021-11-20 07:27:26,665 INFO L354 Elim1Store]: treesize reduction 940, result has 9.7 percent of original size [2021-11-20 07:27:26,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 55 case distinctions, treesize of input 115 treesize of output 141 [2021-11-20 07:27:27,165 INFO L354 Elim1Store]: treesize reduction 1111, result has 9.1 percent of original size [2021-11-20 07:27:27,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 11 select indices, 11 select index equivalence classes, 0 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 66 case distinctions, treesize of input 125 treesize of output 154 [2021-11-20 07:27:27,795 INFO L354 Elim1Store]: treesize reduction 1872, result has 7.7 percent of original size [2021-11-20 07:27:27,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 78 case distinctions, treesize of input 306 treesize of output 228 [2021-11-20 07:27:37,867 WARN L322 ript$VariableManager]: TermVariabe |aux_mod_v_#Ultimate.C_memset_#t~loopctr676_253_92| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-11-20 07:27:37,868 WARN L322 ript$VariableManager]: TermVariabe |aux_div_v_#Ultimate.C_memset_#t~loopctr676_253_92| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-11-20 07:27:37,944 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 0 proven. 148 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 07:27:37,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 07:27:51,156 WARN L227 SmtUtils]: Spent 10.54s on a formula simplification. DAG size of input: 130 DAG size of output: 128 (called from [L 231] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-20 07:27:52,327 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 147 treesize of output 143 [2021-11-20 07:28:19,446 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 175 treesize of output 171 [2021-11-20 07:28:19,460 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-11-20 07:28:19,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 376789 treesize of output 376783 [2021-11-20 07:28:33,201 WARN L227 SmtUtils]: Spent 8.76s on a formula simplification. DAG size of input: 175 DAG size of output: 176 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-20 07:28:51,127 WARN L227 SmtUtils]: Spent 6.76s on a formula simplification. DAG size of input: 150 DAG size of output: 150 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify)