./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/aws-c-common/memset_using_uint64_harness.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/aws-c-common/memset_using_uint64_harness.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7 --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 Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 9ff439c9da308e48e314eaeb6f620d0560f5430b3c601570b5afd8d635a5b965 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 17:57:14,593 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 17:57:14,595 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 17:57:14,633 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 17:57:14,634 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 17:57:14,635 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 17:57:14,637 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 17:57:14,639 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 17:57:14,641 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 17:57:14,642 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 17:57:14,643 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 17:57:14,645 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 17:57:14,645 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 17:57:14,646 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 17:57:14,648 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 17:57:14,649 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 17:57:14,650 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 17:57:14,652 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 17:57:14,654 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 17:57:14,656 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 17:57:14,658 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 17:57:14,660 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 17:57:14,662 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 17:57:14,663 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 17:57:14,666 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 17:57:14,667 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 17:57:14,667 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 17:57:14,668 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 17:57:14,669 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 17:57:14,670 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 17:57:14,670 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 17:57:14,671 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 17:57:14,672 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 17:57:14,673 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 17:57:14,674 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 17:57:14,674 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 17:57:14,675 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 17:57:14,676 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 17:57:14,676 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 17:57:14,677 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 17:57:14,678 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 17:57:14,679 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-64bit-Taipan_Default.epf [2021-11-25 17:57:14,705 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 17:57:14,705 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 17:57:14,706 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 17:57:14,706 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 17:57:14,707 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 17:57:14,713 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 17:57:14,714 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 17:57:14,714 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 17:57:14,715 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 17:57:14,715 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 17:57:14,715 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 17:57:14,716 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 17:57:14,716 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 17:57:14,716 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 17:57:14,717 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 17:57:14,717 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 17:57:14,718 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 17:57:14,718 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 17:57:14,719 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 17:57:14,721 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 17:57:14,721 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 17:57:14,721 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 17:57:14,722 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 17:57:14,722 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 17:57:14,723 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 17:57:14,723 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 17:57:14,723 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 17:57:14,725 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 17:57:14,725 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 17:57:14,725 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:57:14,725 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 17:57:14,726 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 17:57:14,726 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 17:57:14,726 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 17:57:14,726 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 17:57:14,726 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 17:57:14,727 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 17:57:14,727 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 17:57:14,727 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9ff439c9da308e48e314eaeb6f620d0560f5430b3c601570b5afd8d635a5b965 [2021-11-25 17:57:15,028 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 17:57:15,052 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 17:57:15,054 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 17:57:15,055 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 17:57:15,057 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 17:57:15,058 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/aws-c-common/memset_using_uint64_harness.i [2021-11-25 17:57:15,131 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/data/b332aae83/dfedbaaaa5e741979c664a3f31b29ae3/FLAG9fd657599 [2021-11-25 17:57:16,045 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 17:57:16,046 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/sv-benchmarks/c/aws-c-common/memset_using_uint64_harness.i [2021-11-25 17:57:16,085 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/data/b332aae83/dfedbaaaa5e741979c664a3f31b29ae3/FLAG9fd657599 [2021-11-25 17:57:16,582 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/data/b332aae83/dfedbaaaa5e741979c664a3f31b29ae3 [2021-11-25 17:57:16,585 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 17:57:16,586 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 17:57:16,589 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 17:57:16,589 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 17:57:16,593 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 17:57:16,593 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:57:16" (1/1) ... [2021-11-25 17:57:16,595 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@fe49bd5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:16, skipping insertion in model container [2021-11-25 17:57:16,595 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:57:16" (1/1) ... [2021-11-25 17:57:16,603 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 17:57:16,721 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 17:57:16,983 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_2b339075-6d33-4432-909b-d1e03be6e28d/sv-benchmarks/c/aws-c-common/memset_using_uint64_harness.i[4493,4506] [2021-11-25 17:57:16,989 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_2b339075-6d33-4432-909b-d1e03be6e28d/sv-benchmarks/c/aws-c-common/memset_using_uint64_harness.i[4553,4566] [2021-11-25 17:57:17,827 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:17,827 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:17,828 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:17,829 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:17,830 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:17,843 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:17,844 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:17,846 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:17,847 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:17,849 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:17,850 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:17,851 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:17,851 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:18,026 WARN L610 FunctionHandler]: implicit declaration of function __atomic_load_n [2021-11-25 17:57:18,027 WARN L610 FunctionHandler]: implicit declaration of function __atomic_store_n [2021-11-25 17:57:18,028 WARN L610 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2021-11-25 17:57:18,030 WARN L610 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2021-11-25 17:57:18,031 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2021-11-25 17:57:18,032 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2021-11-25 17:57:18,033 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2021-11-25 17:57:18,033 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2021-11-25 17:57:18,034 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2021-11-25 17:57:18,035 WARN L610 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2021-11-25 17:57:18,101 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:57:18,111 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 17:57:18,124 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_2b339075-6d33-4432-909b-d1e03be6e28d/sv-benchmarks/c/aws-c-common/memset_using_uint64_harness.i[4493,4506] [2021-11-25 17:57:18,125 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_2b339075-6d33-4432-909b-d1e03be6e28d/sv-benchmarks/c/aws-c-common/memset_using_uint64_harness.i[4553,4566] [2021-11-25 17:57:18,196 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:18,197 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:18,197 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:18,198 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:18,199 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:18,207 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:18,208 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:18,209 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:18,210 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:18,224 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:18,225 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:18,225 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:18,225 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:18,243 WARN L610 FunctionHandler]: implicit declaration of function __atomic_load_n [2021-11-25 17:57:18,244 WARN L610 FunctionHandler]: implicit declaration of function __atomic_store_n [2021-11-25 17:57:18,245 WARN L610 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2021-11-25 17:57:18,246 WARN L610 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2021-11-25 17:57:18,247 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2021-11-25 17:57:18,247 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2021-11-25 17:57:18,248 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2021-11-25 17:57:18,249 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2021-11-25 17:57:18,249 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2021-11-25 17:57:18,250 WARN L610 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2021-11-25 17:57:18,270 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:57:18,410 INFO L208 MainTranslator]: Completed translation [2021-11-25 17:57:18,410 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:18 WrapperNode [2021-11-25 17:57:18,410 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 17:57:18,411 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 17:57:18,412 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 17:57:18,412 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 17:57:18,419 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:18" (1/1) ... [2021-11-25 17:57:18,507 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:18" (1/1) ... [2021-11-25 17:57:18,588 INFO L137 Inliner]: procedures = 592, calls = 625, calls flagged for inlining = 38, calls inlined = 6, statements flattened = 123 [2021-11-25 17:57:18,589 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 17:57:18,590 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 17:57:18,590 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 17:57:18,590 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 17:57:18,599 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:18" (1/1) ... [2021-11-25 17:57:18,599 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:18" (1/1) ... [2021-11-25 17:57:18,603 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:18" (1/1) ... [2021-11-25 17:57:18,604 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:18" (1/1) ... [2021-11-25 17:57:18,617 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:18" (1/1) ... [2021-11-25 17:57:18,621 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:18" (1/1) ... [2021-11-25 17:57:18,625 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:18" (1/1) ... [2021-11-25 17:57:18,631 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 17:57:18,632 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 17:57:18,632 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 17:57:18,632 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 17:57:18,633 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:18" (1/1) ... [2021-11-25 17:57:18,665 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:57:18,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:57:18,694 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 17:57:18,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 17:57:18,740 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 17:57:18,741 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 17:57:18,741 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 17:57:18,741 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 17:57:18,741 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 17:57:18,741 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 17:57:18,741 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 17:57:18,742 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-25 17:57:18,742 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-25 17:57:18,742 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 17:57:18,742 INFO L130 BoogieDeclarations]: Found specification of procedure assert_all_bytes_are [2021-11-25 17:57:18,742 INFO L138 BoogieDeclarations]: Found implementation of procedure assert_all_bytes_are [2021-11-25 17:57:18,743 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_uint64_t [2021-11-25 17:57:18,743 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_uint64_t [2021-11-25 17:57:18,743 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 17:57:18,743 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 17:57:18,994 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 17:57:19,007 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 17:57:19,426 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 17:57:19,713 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 17:57:19,713 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 17:57:19,716 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:57:19 BoogieIcfgContainer [2021-11-25 17:57:19,716 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 17:57:19,719 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 17:57:19,719 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 17:57:19,723 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 17:57:19,724 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 05:57:16" (1/3) ... [2021-11-25 17:57:19,725 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32e96bff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:57:19, skipping insertion in model container [2021-11-25 17:57:19,726 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:18" (2/3) ... [2021-11-25 17:57:19,726 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32e96bff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:57:19, skipping insertion in model container [2021-11-25 17:57:19,726 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:57:19" (3/3) ... [2021-11-25 17:57:19,728 INFO L111 eAbstractionObserver]: Analyzing ICFG memset_using_uint64_harness.i [2021-11-25 17:57:19,733 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 17:57:19,734 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 17:57:19,801 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 17:57:19,819 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=FINITE_AUTOMATA, 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 [2021-11-25 17:57:19,819 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 17:57:19,849 INFO L276 IsEmpty]: Start isEmpty. Operand has 42 states, 25 states have (on average 1.28) internal successors, (32), 26 states have internal predecessors, (32), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 17:57:19,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 17:57:19,854 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:57:19,855 INFO L514 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:57:19,855 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:57:19,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:57:19,861 INFO L85 PathProgramCache]: Analyzing trace with hash 727452986, now seen corresponding path program 1 times [2021-11-25 17:57:19,872 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:57:19,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1880864593] [2021-11-25 17:57:19,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:57:19,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:57:20,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:57:20,832 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 17:57:20,832 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:57:20,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1880864593] [2021-11-25 17:57:20,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1880864593] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:57:20,834 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:57:20,834 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 17:57:20,836 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025535740] [2021-11-25 17:57:20,837 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:57:20,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:57:20,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:57:20,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:57:20,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:57:20,879 INFO L87 Difference]: Start difference. First operand has 42 states, 25 states have (on average 1.28) internal successors, (32), 26 states have internal predecessors, (32), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 17:57:22,950 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 17:57:23,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:57:23,104 INFO L93 Difference]: Finished difference Result 77 states and 98 transitions. [2021-11-25 17:57:23,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 17:57:23,107 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 19 [2021-11-25 17:57:23,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:57:23,115 INFO L225 Difference]: With dead ends: 77 [2021-11-25 17:57:23,115 INFO L226 Difference]: Without dead ends: 41 [2021-11-25 17:57:23,118 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 17:57:23,121 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 22 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 11 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:57:23,122 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 158 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 65 Invalid, 1 Unknown, 0 Unchecked, 2.1s Time] [2021-11-25 17:57:23,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-25 17:57:23,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-25 17:57:23,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 25 states have (on average 1.2) internal successors, (30), 26 states have internal predecessors, (30), 11 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 17:57:23,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 50 transitions. [2021-11-25 17:57:23,163 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 50 transitions. Word has length 19 [2021-11-25 17:57:23,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:57:23,165 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 50 transitions. [2021-11-25 17:57:23,165 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 17:57:23,165 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 50 transitions. [2021-11-25 17:57:23,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-25 17:57:23,167 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:57:23,167 INFO L514 BasicCegarLoop]: trace histogram [4, 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] [2021-11-25 17:57:23,168 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 17:57:23,168 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:57:23,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:57:23,169 INFO L85 PathProgramCache]: Analyzing trace with hash 1509833810, now seen corresponding path program 1 times [2021-11-25 17:57:23,169 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:57:23,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889993789] [2021-11-25 17:57:23,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:57:23,170 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:57:23,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:57:23,547 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 17:57:23,548 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:57:23,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889993789] [2021-11-25 17:57:23,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [889993789] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:57:23,548 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:57:23,549 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 17:57:23,549 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436820339] [2021-11-25 17:57:23,549 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:57:23,550 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 17:57:23,550 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:57:23,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 17:57:23,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:57:23,552 INFO L87 Difference]: Start difference. First operand 41 states and 50 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-25 17:57:25,624 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 17:57:25,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:57:25,697 INFO L93 Difference]: Finished difference Result 74 states and 89 transitions. [2021-11-25 17:57:25,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 17:57:25,698 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 33 [2021-11-25 17:57:25,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:57:25,699 INFO L225 Difference]: With dead ends: 74 [2021-11-25 17:57:25,699 INFO L226 Difference]: Without dead ends: 49 [2021-11-25 17:57:25,700 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 17:57:25,701 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 12 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:57:25,702 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 141 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 47 Invalid, 1 Unknown, 0 Unchecked, 2.1s Time] [2021-11-25 17:57:25,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-25 17:57:25,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2021-11-25 17:57:25,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 29 states have (on average 1.206896551724138) internal successors, (35), 30 states have internal predecessors, (35), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 17:57:25,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 59 transitions. [2021-11-25 17:57:25,726 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 59 transitions. Word has length 33 [2021-11-25 17:57:25,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:57:25,726 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 59 transitions. [2021-11-25 17:57:25,727 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-25 17:57:25,727 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 59 transitions. [2021-11-25 17:57:25,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 17:57:25,729 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:57:25,729 INFO L514 BasicCegarLoop]: trace histogram [4, 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] [2021-11-25 17:57:25,729 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 17:57:25,729 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:57:25,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:57:25,730 INFO L85 PathProgramCache]: Analyzing trace with hash -1817674979, now seen corresponding path program 1 times [2021-11-25 17:57:25,730 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:57:25,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [275435334] [2021-11-25 17:57:25,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:57:25,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:57:25,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:57:25,865 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 17:57:25,865 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:57:25,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [275435334] [2021-11-25 17:57:25,867 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [275435334] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:57:25,868 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:57:25,868 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 17:57:25,870 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684779707] [2021-11-25 17:57:25,872 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:57:25,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:57:25,874 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:57:25,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:57:25,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:57:25,876 INFO L87 Difference]: Start difference. First operand 47 states and 59 transitions. Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-25 17:57:27,921 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 17:57:27,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:57:27,948 INFO L93 Difference]: Finished difference Result 83 states and 101 transitions. [2021-11-25 17:57:27,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:57:27,949 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 34 [2021-11-25 17:57:27,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:57:27,950 INFO L225 Difference]: With dead ends: 83 [2021-11-25 17:57:27,951 INFO L226 Difference]: Without dead ends: 48 [2021-11-25 17:57:27,951 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:57:27,952 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 0 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:57:27,953 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 73 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 1 Unknown, 0 Unchecked, 2.0s Time] [2021-11-25 17:57:27,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-25 17:57:27,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-11-25 17:57:27,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 30 states have (on average 1.2) internal successors, (36), 31 states have internal predecessors, (36), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 17:57:27,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 60 transitions. [2021-11-25 17:57:27,964 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 60 transitions. Word has length 34 [2021-11-25 17:57:27,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:57:27,965 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 60 transitions. [2021-11-25 17:57:27,965 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-25 17:57:27,965 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 60 transitions. [2021-11-25 17:57:27,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-25 17:57:27,967 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:57:27,967 INFO L514 BasicCegarLoop]: trace histogram [4, 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] [2021-11-25 17:57:27,967 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 17:57:27,968 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:57:27,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:57:27,968 INFO L85 PathProgramCache]: Analyzing trace with hash -1891232334, now seen corresponding path program 1 times [2021-11-25 17:57:27,968 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:57:27,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [951038158] [2021-11-25 17:57:27,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:57:27,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:57:28,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-25 17:57:28,335 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-11-25 17:57:28,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-25 17:57:28,668 INFO L133 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2021-11-25 17:57:28,668 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-11-25 17:57:28,669 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-25 17:57:28,671 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 17:57:28,675 INFO L732 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2021-11-25 17:57:28,677 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-25 17:57:28,721 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.11 05:57:28 BoogieIcfgContainer [2021-11-25 17:57:28,722 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-25 17:57:28,722 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-25 17:57:28,722 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-25 17:57:28,723 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-25 17:57:28,723 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:57:19" (3/4) ... [2021-11-25 17:57:28,726 INFO L140 WitnessPrinter]: No result that supports witness generation found [2021-11-25 17:57:28,726 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-25 17:57:28,727 INFO L158 Benchmark]: Toolchain (without parser) took 12140.48ms. Allocated memory was 100.7MB in the beginning and 174.1MB in the end (delta: 73.4MB). Free memory was 57.6MB in the beginning and 67.5MB in the end (delta: -9.9MB). Peak memory consumption was 63.9MB. Max. memory is 16.1GB. [2021-11-25 17:57:28,727 INFO L158 Benchmark]: CDTParser took 0.18ms. Allocated memory is still 100.7MB. Free memory is still 79.2MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-25 17:57:28,728 INFO L158 Benchmark]: CACSL2BoogieTranslator took 1821.72ms. Allocated memory was 100.7MB in the beginning and 134.2MB in the end (delta: 33.6MB). Free memory was 57.4MB in the beginning and 52.4MB in the end (delta: 5.0MB). Peak memory consumption was 39.8MB. Max. memory is 16.1GB. [2021-11-25 17:57:28,728 INFO L158 Benchmark]: Boogie Procedure Inliner took 177.72ms. Allocated memory is still 134.2MB. Free memory was 52.4MB in the beginning and 98.2MB in the end (delta: -45.7MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-11-25 17:57:28,729 INFO L158 Benchmark]: Boogie Preprocessor took 41.17ms. Allocated memory is still 134.2MB. Free memory was 98.2MB in the beginning and 95.5MB in the end (delta: 2.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-25 17:57:28,729 INFO L158 Benchmark]: RCFGBuilder took 1084.35ms. Allocated memory was 134.2MB in the beginning and 174.1MB in the end (delta: 39.8MB). Free memory was 95.5MB in the beginning and 128.7MB in the end (delta: -33.1MB). Peak memory consumption was 50.7MB. Max. memory is 16.1GB. [2021-11-25 17:57:28,730 INFO L158 Benchmark]: TraceAbstraction took 9003.12ms. Allocated memory is still 174.1MB. Free memory was 127.6MB in the beginning and 67.5MB in the end (delta: 60.1MB). Peak memory consumption was 80.0MB. Max. memory is 16.1GB. [2021-11-25 17:57:28,730 INFO L158 Benchmark]: Witness Printer took 4.05ms. Allocated memory is still 174.1MB. Free memory is still 67.5MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-25 17:57:28,733 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18ms. Allocated memory is still 100.7MB. Free memory is still 79.2MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 1821.72ms. Allocated memory was 100.7MB in the beginning and 134.2MB in the end (delta: 33.6MB). Free memory was 57.4MB in the beginning and 52.4MB in the end (delta: 5.0MB). Peak memory consumption was 39.8MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 177.72ms. Allocated memory is still 134.2MB. Free memory was 52.4MB in the beginning and 98.2MB in the end (delta: -45.7MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Boogie Preprocessor took 41.17ms. Allocated memory is still 134.2MB. Free memory was 98.2MB in the beginning and 95.5MB in the end (delta: 2.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 1084.35ms. Allocated memory was 134.2MB in the beginning and 174.1MB in the end (delta: 39.8MB). Free memory was 95.5MB in the beginning and 128.7MB in the end (delta: -33.1MB). Peak memory consumption was 50.7MB. Max. memory is 16.1GB. * TraceAbstraction took 9003.12ms. Allocated memory is still 174.1MB. Free memory was 127.6MB in the beginning and 67.5MB in the end (delta: 60.1MB). Peak memory consumption was 80.0MB. Max. memory is 16.1GB. * Witness Printer took 4.05ms. Allocated memory is still 174.1MB. Free memory is still 67.5MB. There was no memory consumed. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - UnprovableResult [Line: 223]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: overapproximation of bitwiseAnd at line 5884. Possible FailurePath: [L5947] CALL memset_using_uint64_harness() [L5937] short d1[160]; [L5938] short d2[160]; [L5939] int c = __VERIFIER_nondet_int(); [L5940] unsigned size = __VERIFIER_nondet_uint(); [L5941] CALL assume_abort_if_not(size < 160) VAL [\old(cond)=1] [L211] COND FALSE !(!cond) [L5941] RET assume_abort_if_not(size < 160) VAL [c=255, d1={10:0}, d2={11:0}, size=1] [L5942] CALL memset_impl(d1, c, size) [L5870] CALL assume_abort_if_not((((n) == 0) || (s))) VAL [\old(cond)=1] [L211] COND FALSE !(!cond) [L5870] RET assume_abort_if_not((((n) == 0) || (s))) VAL [c=255, n=1, s={10:0}] [L5871] COND TRUE n > 0 [L5872] char *sp = (char *)s; [L5873] unsigned long i = 0; VAL [c=255, i=0, n=1, s={10:0}, sp={10:0}] [L5873] COND TRUE i < n [L5874] sp[i] = c [L5873] i++ VAL [c=255, i=1, n=1, s={10:0}, sp={10:0}] [L5873] COND FALSE !(i < n) VAL [c=255, i=1, n=1, s={10:0}, sp={10:0}] [L5876] return s; [L5942] RET memset_impl(d1, c, size) [L5943] CALL memset_using_uint64_impl(d2, c, size) [L5881] CALL assume_abort_if_not((((n) == 0) || (dst))) VAL [\old(cond)=1] [L211] COND FALSE !(!cond) [L5881] RET assume_abort_if_not((((n) == 0) || (dst))) VAL [c=255, dst={11:0}, n=1] [L5883] size_t num_uint64s = n >> 3; [L5884] size_t rem = n & 0x7; [L5886] uint8_t *d = (uint8_t *)dst; [L5890] case 7: [L5892] case 6: [L5894] case 5: [L5896] case 4: [L5898] case 3: [L5900] case 2: [L5902] case 1: [L5906] d += rem [L5908] uint64_t compounded = 0; [L5909] COND FALSE !(num_uint64s > 0 && c != 0) [L5921] size_t i = 0; VAL [c=255, chars={10:14}, compounded={9:0}, d={11:0}, dst={11:0}, i=0, n=1, num_uint64s=0, rem=0] [L5921] COND FALSE !(i < num_uint64s) [L5925] return dst; [L5908] uint64_t compounded = 0; [L5925] return dst; [L5943] RET memset_using_uint64_impl(d2, c, size) [L5944] CALL assert_bytes_match(d1, d2, size) [L5654] CALL __VERIFIER_assert(!a == !b) VAL [\old(cond)=1] [L223] COND FALSE !(!cond) VAL [\old(cond)=1, cond=1] [L5654] RET __VERIFIER_assert(!a == !b) VAL [\old(len)=1, a={10:0}, a={10:0}, b={11:0}, b={11:0}, len=1] [L5655-L5658] COND TRUE len > 0 && a != ((void *)0) && b != ((void *)0) VAL [\old(len)=1, a={10:0}, a={10:0}, b={11:0}, b={11:0}, len=1] [L5660] CALL, EXPR nondet_uint64_t() [L266] return __VERIFIER_nondet_ulong(); [L5660] RET, EXPR nondet_uint64_t() VAL [\old(len)=1, a={10:0}, a={10:0}, b={11:0}, b={11:0}, len=1, nondet_uint64_t()=18446744073709551616] [L5660] size_t i = nondet_uint64_t(); [L5661-L5663] CALL assume_abort_if_not(i < len && len < ( (18446744073709551615UL) >> (8 + 1))) VAL [\old(cond)=1] [L211] COND FALSE !(!cond) [L5661-L5663] RET assume_abort_if_not(i < len && len < ( (18446744073709551615UL) >> (8 + 1))) VAL [\old(len)=1, a={10:0}, a={10:0}, b={11:0}, b={11:0}, i=0, len=1] [L5664] EXPR a[i] [L5664] EXPR b[i] VAL [\old(len)=1, a={10:0}, a={10:0}, a[i]=-1, b={11:0}, b={11:0}, b[i]=13, i=0, len=1] [L5664] CALL __VERIFIER_assert(a[i] == b[i]) VAL [\old(cond)=0] [L223] COND TRUE !cond VAL [\old(cond)=0, cond=0] [L223] reach_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 42 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 8.9s, OverallIterations: 4, TraceHistogramMax: 4, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 6.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 3 mSolverCounterUnknown, 35 SdHoareTripleChecker+Valid, 6.3s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 34 mSDsluCounter, 372 SdHoareTripleChecker+Invalid, 6.2s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 298 mSDsCounter, 13 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 130 IncrementalHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 13 mSolverCounterUnsat, 112 mSDtfsCounter, 130 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 21 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=48occurred in iteration=3, InterpolantAutomatonStates: 16, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 3 MinimizatonAttempts, 2 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 1.0s SatisfiabilityAnalysisTime, 0.6s InterpolantComputationTime, 121 NumberOfCodeBlocks, 121 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 83 ConstructedInterpolants, 0 QuantifiedInterpolants, 316 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 3 PerfectInterpolantSequences, 34/34 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces [2021-11-25 17:57:28,794 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/aws-c-common/memset_using_uint64_harness.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-64bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7 --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 Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 9ff439c9da308e48e314eaeb6f620d0560f5430b3c601570b5afd8d635a5b965 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 17:57:31,192 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 17:57:31,195 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 17:57:31,238 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 17:57:31,238 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 17:57:31,243 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 17:57:31,245 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 17:57:31,252 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 17:57:31,255 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 17:57:31,263 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 17:57:31,264 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 17:57:31,266 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 17:57:31,267 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 17:57:31,269 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 17:57:31,272 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 17:57:31,276 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 17:57:31,278 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 17:57:31,279 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 17:57:31,293 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 17:57:31,301 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 17:57:31,303 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 17:57:31,305 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 17:57:31,307 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 17:57:31,309 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 17:57:31,318 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 17:57:31,319 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 17:57:31,319 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 17:57:31,322 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 17:57:31,322 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 17:57:31,324 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 17:57:31,324 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 17:57:31,325 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 17:57:31,327 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 17:57:31,328 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 17:57:31,330 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 17:57:31,330 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 17:57:31,331 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 17:57:31,332 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 17:57:31,332 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 17:57:31,334 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 17:57:31,335 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 17:57:31,336 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-64bit-Taipan_Bitvector.epf [2021-11-25 17:57:31,381 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 17:57:31,382 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 17:57:31,382 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 17:57:31,383 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 17:57:31,384 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 17:57:31,384 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 17:57:31,384 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 17:57:31,385 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 17:57:31,385 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 17:57:31,385 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 17:57:31,386 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 17:57:31,387 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 17:57:31,388 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 17:57:31,389 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 17:57:31,389 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 17:57:31,389 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 17:57:31,389 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 17:57:31,390 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-25 17:57:31,390 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-25 17:57:31,390 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-25 17:57:31,390 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 17:57:31,391 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 17:57:31,391 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 17:57:31,391 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 17:57:31,391 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-25 17:57:31,392 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 17:57:31,392 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:57:31,392 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 17:57:31,392 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 17:57:31,393 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 17:57:31,393 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-25 17:57:31,393 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-25 17:57:31,394 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 17:57:31,394 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 17:57:31,394 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 17:57:31,395 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9ff439c9da308e48e314eaeb6f620d0560f5430b3c601570b5afd8d635a5b965 [2021-11-25 17:57:31,771 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 17:57:31,803 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 17:57:31,806 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 17:57:31,807 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 17:57:31,808 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 17:57:31,809 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/aws-c-common/memset_using_uint64_harness.i [2021-11-25 17:57:31,877 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/data/9ab45c769/8fe4c2bec6be4c49a53966fa3e69cd45/FLAGda587da23 [2021-11-25 17:57:32,657 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 17:57:32,658 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/sv-benchmarks/c/aws-c-common/memset_using_uint64_harness.i [2021-11-25 17:57:32,693 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/data/9ab45c769/8fe4c2bec6be4c49a53966fa3e69cd45/FLAGda587da23 [2021-11-25 17:57:32,762 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/data/9ab45c769/8fe4c2bec6be4c49a53966fa3e69cd45 [2021-11-25 17:57:32,765 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 17:57:32,767 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 17:57:32,771 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 17:57:32,771 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 17:57:32,775 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 17:57:32,776 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:57:32" (1/1) ... [2021-11-25 17:57:32,777 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@56696a78 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:32, skipping insertion in model container [2021-11-25 17:57:32,777 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:57:32" (1/1) ... [2021-11-25 17:57:32,785 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 17:57:32,901 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 17:57:33,190 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_2b339075-6d33-4432-909b-d1e03be6e28d/sv-benchmarks/c/aws-c-common/memset_using_uint64_harness.i[4493,4506] [2021-11-25 17:57:33,205 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_2b339075-6d33-4432-909b-d1e03be6e28d/sv-benchmarks/c/aws-c-common/memset_using_uint64_harness.i[4553,4566] [2021-11-25 17:57:33,869 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:33,870 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:33,870 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:33,871 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:33,872 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:33,885 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:33,886 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:33,888 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:33,889 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:33,891 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:33,892 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:33,893 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:33,893 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,055 WARN L610 FunctionHandler]: implicit declaration of function __atomic_load_n [2021-11-25 17:57:34,056 WARN L610 FunctionHandler]: implicit declaration of function __atomic_store_n [2021-11-25 17:57:34,058 WARN L610 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2021-11-25 17:57:34,059 WARN L610 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2021-11-25 17:57:34,060 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2021-11-25 17:57:34,061 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2021-11-25 17:57:34,062 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2021-11-25 17:57:34,062 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2021-11-25 17:57:34,063 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2021-11-25 17:57:34,064 WARN L610 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2021-11-25 17:57:34,146 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:57:34,170 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-25 17:57:34,216 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 17:57:34,225 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_2b339075-6d33-4432-909b-d1e03be6e28d/sv-benchmarks/c/aws-c-common/memset_using_uint64_harness.i[4493,4506] [2021-11-25 17:57:34,225 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_2b339075-6d33-4432-909b-d1e03be6e28d/sv-benchmarks/c/aws-c-common/memset_using_uint64_harness.i[4553,4566] [2021-11-25 17:57:34,311 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,311 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,312 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,312 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,313 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,321 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,322 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,323 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,323 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,325 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,325 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,326 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,326 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,355 WARN L610 FunctionHandler]: implicit declaration of function __atomic_load_n [2021-11-25 17:57:34,356 WARN L610 FunctionHandler]: implicit declaration of function __atomic_store_n [2021-11-25 17:57:34,356 WARN L610 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2021-11-25 17:57:34,357 WARN L610 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2021-11-25 17:57:34,362 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2021-11-25 17:57:34,363 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2021-11-25 17:57:34,364 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2021-11-25 17:57:34,364 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2021-11-25 17:57:34,365 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2021-11-25 17:57:34,365 WARN L610 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2021-11-25 17:57:34,400 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:57:34,405 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 17:57:34,433 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_2b339075-6d33-4432-909b-d1e03be6e28d/sv-benchmarks/c/aws-c-common/memset_using_uint64_harness.i[4493,4506] [2021-11-25 17:57:34,439 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_2b339075-6d33-4432-909b-d1e03be6e28d/sv-benchmarks/c/aws-c-common/memset_using_uint64_harness.i[4553,4566] [2021-11-25 17:57:34,506 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,506 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,507 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,507 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,508 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,521 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,522 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,523 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,524 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,525 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,526 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,526 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,526 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:57:34,545 WARN L610 FunctionHandler]: implicit declaration of function __atomic_load_n [2021-11-25 17:57:34,546 WARN L610 FunctionHandler]: implicit declaration of function __atomic_store_n [2021-11-25 17:57:34,547 WARN L610 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2021-11-25 17:57:34,548 WARN L610 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2021-11-25 17:57:34,549 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2021-11-25 17:57:34,549 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2021-11-25 17:57:34,550 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2021-11-25 17:57:34,550 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2021-11-25 17:57:34,551 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2021-11-25 17:57:34,551 WARN L610 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2021-11-25 17:57:34,568 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:57:34,836 INFO L208 MainTranslator]: Completed translation [2021-11-25 17:57:34,836 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:34 WrapperNode [2021-11-25 17:57:34,837 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 17:57:34,838 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 17:57:34,838 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 17:57:34,838 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 17:57:34,846 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:34" (1/1) ... [2021-11-25 17:57:34,948 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:34" (1/1) ... [2021-11-25 17:57:34,984 INFO L137 Inliner]: procedures = 611, calls = 625, calls flagged for inlining = 38, calls inlined = 6, statements flattened = 123 [2021-11-25 17:57:34,985 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 17:57:34,986 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 17:57:34,986 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 17:57:34,986 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 17:57:34,994 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:34" (1/1) ... [2021-11-25 17:57:34,994 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:34" (1/1) ... [2021-11-25 17:57:35,013 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:34" (1/1) ... [2021-11-25 17:57:35,013 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:34" (1/1) ... [2021-11-25 17:57:35,055 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:34" (1/1) ... [2021-11-25 17:57:35,060 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:34" (1/1) ... [2021-11-25 17:57:35,080 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:34" (1/1) ... [2021-11-25 17:57:35,086 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 17:57:35,091 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 17:57:35,092 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 17:57:35,092 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 17:57:35,093 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:34" (1/1) ... [2021-11-25 17:57:35,100 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:57:35,110 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:57:35,124 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 17:57:35,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 17:57:35,177 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 17:57:35,177 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-25 17:57:35,178 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE8 [2021-11-25 17:57:35,178 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 17:57:35,178 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 17:57:35,178 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 17:57:35,178 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 17:57:35,178 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 17:57:35,179 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2021-11-25 17:57:35,180 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE8 [2021-11-25 17:57:35,180 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-25 17:57:35,180 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-25 17:57:35,181 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 17:57:35,181 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE8 [2021-11-25 17:57:35,181 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2021-11-25 17:57:35,181 INFO L130 BoogieDeclarations]: Found specification of procedure assert_all_bytes_are [2021-11-25 17:57:35,181 INFO L138 BoogieDeclarations]: Found implementation of procedure assert_all_bytes_are [2021-11-25 17:57:35,181 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_uint64_t [2021-11-25 17:57:35,182 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_uint64_t [2021-11-25 17:57:35,416 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 17:57:35,418 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 17:57:37,918 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 17:57:37,924 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 17:57:37,925 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 17:57:37,926 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:57:37 BoogieIcfgContainer [2021-11-25 17:57:37,927 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 17:57:37,928 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 17:57:37,929 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 17:57:37,931 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 17:57:37,931 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 05:57:32" (1/3) ... [2021-11-25 17:57:37,932 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@420a189c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:57:37, skipping insertion in model container [2021-11-25 17:57:37,932 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:57:34" (2/3) ... [2021-11-25 17:57:37,933 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@420a189c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:57:37, skipping insertion in model container [2021-11-25 17:57:37,933 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:57:37" (3/3) ... [2021-11-25 17:57:37,934 INFO L111 eAbstractionObserver]: Analyzing ICFG memset_using_uint64_harness.i [2021-11-25 17:57:37,939 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 17:57:37,939 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 17:57:37,984 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 17:57:37,990 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=FINITE_AUTOMATA, 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 [2021-11-25 17:57:37,991 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 17:57:38,005 INFO L276 IsEmpty]: Start isEmpty. Operand has 70 states, 53 states have (on average 1.3396226415094339) internal successors, (71), 54 states have internal predecessors, (71), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 17:57:38,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 17:57:38,011 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:57:38,012 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:57:38,012 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:57:38,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:57:38,017 INFO L85 PathProgramCache]: Analyzing trace with hash 1430345650, now seen corresponding path program 1 times [2021-11-25 17:57:38,029 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:57:38,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1231404822] [2021-11-25 17:57:38,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:57:38,031 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:57:38,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:57:38,039 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:57:38,072 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-25 17:57:38,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:57:38,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-25 17:57:38,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:57:38,584 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 17:57:38,585 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:57:38,586 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:57:38,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1231404822] [2021-11-25 17:57:38,587 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1231404822] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:57:38,587 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:57:38,587 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 17:57:38,589 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64530247] [2021-11-25 17:57:38,590 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:57:38,594 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 17:57:38,594 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:57:38,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 17:57:38,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 17:57:38,634 INFO L87 Difference]: Start difference. First operand has 70 states, 53 states have (on average 1.3396226415094339) internal successors, (71), 54 states have internal predecessors, (71), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Second operand has 2 states, 2 states have (on average 18.0) internal successors, (36), 2 states have internal predecessors, (36), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 17:57:38,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:57:38,672 INFO L93 Difference]: Finished difference Result 137 states and 191 transitions. [2021-11-25 17:57:38,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 17:57:38,674 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 18.0) internal successors, (36), 2 states have internal predecessors, (36), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 45 [2021-11-25 17:57:38,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:57:38,682 INFO L225 Difference]: With dead ends: 137 [2021-11-25 17:57:38,682 INFO L226 Difference]: Without dead ends: 62 [2021-11-25 17:57:38,686 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 17:57:38,689 INFO L933 BasicCegarLoop]: 89 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, 89 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 [2021-11-25 17:57:38,691 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 17:57:38,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-25 17:57:38,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2021-11-25 17:57:38,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 47 states have (on average 1.2765957446808511) internal successors, (60), 48 states have internal predecessors, (60), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 17:57:38,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 80 transitions. [2021-11-25 17:57:38,732 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 80 transitions. Word has length 45 [2021-11-25 17:57:38,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:57:38,733 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 80 transitions. [2021-11-25 17:57:38,733 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 18.0) internal successors, (36), 2 states have internal predecessors, (36), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 17:57:38,733 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 80 transitions. [2021-11-25 17:57:38,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 17:57:38,735 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:57:38,736 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:57:38,753 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-25 17:57:38,939 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:57:38,940 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:57:38,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:57:38,941 INFO L85 PathProgramCache]: Analyzing trace with hash -1361752392, now seen corresponding path program 1 times [2021-11-25 17:57:38,942 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:57:38,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1594016769] [2021-11-25 17:57:38,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:57:38,943 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:57:38,943 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:57:38,944 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:57:38,951 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-25 17:57:39,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:57:39,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 17:57:39,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:57:39,468 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 17:57:39,468 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:57:39,468 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:57:39,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1594016769] [2021-11-25 17:57:39,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1594016769] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:57:39,469 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:57:39,469 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 17:57:39,469 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153001957] [2021-11-25 17:57:39,469 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:57:39,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:57:39,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:57:39,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:57:39,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:57:39,477 INFO L87 Difference]: Start difference. First operand 62 states and 80 transitions. Second operand has 6 states, 6 states have (on average 5.333333333333333) internal successors, (32), 6 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 17:57:39,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:57:39,942 INFO L93 Difference]: Finished difference Result 158 states and 203 transitions. [2021-11-25 17:57:39,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 17:57:39,943 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.333333333333333) internal successors, (32), 6 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 45 [2021-11-25 17:57:39,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:57:39,946 INFO L225 Difference]: With dead ends: 158 [2021-11-25 17:57:39,946 INFO L226 Difference]: Without dead ends: 109 [2021-11-25 17:57:39,947 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-25 17:57:39,948 INFO L933 BasicCegarLoop]: 108 mSDtfsCounter, 47 mSDsluCounter, 340 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 448 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 23 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 17:57:39,949 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 448 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 100 Invalid, 0 Unknown, 23 Unchecked, 0.3s Time] [2021-11-25 17:57:39,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-11-25 17:57:39,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 67. [2021-11-25 17:57:39,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 51 states have (on average 1.2549019607843137) internal successors, (64), 52 states have internal predecessors, (64), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 17:57:39,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 86 transitions. [2021-11-25 17:57:39,981 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 86 transitions. Word has length 45 [2021-11-25 17:57:39,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:57:39,981 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 86 transitions. [2021-11-25 17:57:39,982 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.333333333333333) internal successors, (32), 6 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 17:57:39,982 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 86 transitions. [2021-11-25 17:57:39,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 17:57:39,985 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:57:39,985 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:57:40,005 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-25 17:57:40,195 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:57:40,196 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:57:40,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:57:40,196 INFO L85 PathProgramCache]: Analyzing trace with hash 1127776570, now seen corresponding path program 1 times [2021-11-25 17:57:40,197 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:57:40,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [634879866] [2021-11-25 17:57:40,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:57:40,198 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:57:40,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:57:40,207 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:57:40,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-25 17:57:40,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:57:40,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 17:57:40,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:57:40,997 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 17:57:40,997 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:57:40,997 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:57:40,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [634879866] [2021-11-25 17:57:40,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [634879866] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:57:40,998 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:57:40,998 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 17:57:40,998 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800756300] [2021-11-25 17:57:40,998 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:57:40,999 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 17:57:41,001 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:57:41,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 17:57:41,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 17:57:41,002 INFO L87 Difference]: Start difference. First operand 67 states and 86 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 17:57:41,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:57:41,377 INFO L93 Difference]: Finished difference Result 155 states and 198 transitions. [2021-11-25 17:57:41,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 17:57:41,378 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 45 [2021-11-25 17:57:41,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:57:41,380 INFO L225 Difference]: With dead ends: 155 [2021-11-25 17:57:41,380 INFO L226 Difference]: Without dead ends: 110 [2021-11-25 17:57:41,381 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-25 17:57:41,382 INFO L933 BasicCegarLoop]: 85 mSDtfsCounter, 47 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 371 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 30 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:57:41,383 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 371 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 67 Invalid, 0 Unknown, 30 Unchecked, 0.2s Time] [2021-11-25 17:57:41,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-25 17:57:41,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 71. [2021-11-25 17:57:41,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 55 states have (on average 1.2545454545454546) internal successors, (69), 56 states have internal predecessors, (69), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 17:57:41,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 91 transitions. [2021-11-25 17:57:41,393 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 91 transitions. Word has length 45 [2021-11-25 17:57:41,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:57:41,393 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 91 transitions. [2021-11-25 17:57:41,394 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 17:57:41,394 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 91 transitions. [2021-11-25 17:57:41,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 17:57:41,395 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:57:41,395 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:57:41,415 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-25 17:57:41,608 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:57:41,609 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:57:41,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:57:41,609 INFO L85 PathProgramCache]: Analyzing trace with hash -561167172, now seen corresponding path program 1 times [2021-11-25 17:57:41,610 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:57:41,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [781530609] [2021-11-25 17:57:41,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:57:41,611 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:57:41,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:57:41,612 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:57:41,616 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-25 17:57:41,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:57:41,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 17:57:41,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:57:42,445 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 17:57:42,445 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:57:42,445 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:57:42,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [781530609] [2021-11-25 17:57:42,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [781530609] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:57:42,446 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:57:42,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 17:57:42,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031946766] [2021-11-25 17:57:42,446 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:57:42,446 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 17:57:42,446 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:57:42,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 17:57:42,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 17:57:42,447 INFO L87 Difference]: Start difference. First operand 71 states and 91 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 17:57:42,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:57:42,720 INFO L93 Difference]: Finished difference Result 123 states and 153 transitions. [2021-11-25 17:57:42,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 17:57:42,721 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 45 [2021-11-25 17:57:42,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:57:42,722 INFO L225 Difference]: With dead ends: 123 [2021-11-25 17:57:42,722 INFO L226 Difference]: Without dead ends: 80 [2021-11-25 17:57:42,723 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-25 17:57:42,724 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 17 mSDsluCounter, 302 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 374 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 50 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:57:42,725 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 374 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 52 Invalid, 0 Unknown, 50 Unchecked, 0.2s Time] [2021-11-25 17:57:42,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-25 17:57:42,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 73. [2021-11-25 17:57:42,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 57 states have (on average 1.2456140350877194) internal successors, (71), 58 states have internal predecessors, (71), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 17:57:42,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 93 transitions. [2021-11-25 17:57:42,734 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 93 transitions. Word has length 45 [2021-11-25 17:57:42,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:57:42,734 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 93 transitions. [2021-11-25 17:57:42,735 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 17:57:42,735 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 93 transitions. [2021-11-25 17:57:42,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 17:57:42,736 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:57:42,736 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:57:42,758 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-25 17:57:42,955 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:57:42,955 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:57:42,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:57:42,956 INFO L85 PathProgramCache]: Analyzing trace with hash 2145452222, now seen corresponding path program 1 times [2021-11-25 17:57:42,957 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:57:42,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1566600945] [2021-11-25 17:57:42,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:57:42,957 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:57:42,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:57:42,958 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:57:42,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-25 17:57:43,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:57:43,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 17:57:43,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:57:43,871 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 17:57:43,871 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:57:43,871 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:57:43,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1566600945] [2021-11-25 17:57:43,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1566600945] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:57:43,872 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:57:43,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 17:57:43,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781426471] [2021-11-25 17:57:43,872 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:57:43,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 17:57:43,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:57:43,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 17:57:43,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 17:57:43,874 INFO L87 Difference]: Start difference. First operand 73 states and 93 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 17:57:44,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:57:44,206 INFO L93 Difference]: Finished difference Result 153 states and 194 transitions. [2021-11-25 17:57:44,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 17:57:44,207 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 45 [2021-11-25 17:57:44,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:57:44,208 INFO L225 Difference]: With dead ends: 153 [2021-11-25 17:57:44,208 INFO L226 Difference]: Without dead ends: 112 [2021-11-25 17:57:44,209 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 36 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-25 17:57:44,210 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 47 mSDsluCounter, 271 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 39 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:57:44,210 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 353 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 65 Invalid, 0 Unknown, 39 Unchecked, 0.2s Time] [2021-11-25 17:57:44,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-25 17:57:44,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 75. [2021-11-25 17:57:44,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 59 states have (on average 1.2372881355932204) internal successors, (73), 60 states have internal predecessors, (73), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 17:57:44,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 95 transitions. [2021-11-25 17:57:44,219 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 95 transitions. Word has length 45 [2021-11-25 17:57:44,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:57:44,220 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 95 transitions. [2021-11-25 17:57:44,220 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 17:57:44,220 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 95 transitions. [2021-11-25 17:57:44,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 17:57:44,221 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:57:44,221 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:57:44,243 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-25 17:57:44,443 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:57:44,444 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:57:44,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:57:44,445 INFO L85 PathProgramCache]: Analyzing trace with hash 865588544, now seen corresponding path program 1 times [2021-11-25 17:57:44,445 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:57:44,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2074785766] [2021-11-25 17:57:44,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:57:44,446 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:57:44,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:57:44,447 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:57:44,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-25 17:57:44,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:57:44,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 17:57:44,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:57:45,389 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 17:57:45,389 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:57:45,389 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:57:45,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2074785766] [2021-11-25 17:57:45,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2074785766] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:57:45,390 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:57:45,390 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 17:57:45,390 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716837832] [2021-11-25 17:57:45,391 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:57:45,393 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 17:57:45,393 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:57:45,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 17:57:45,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 17:57:45,394 INFO L87 Difference]: Start difference. First operand 75 states and 95 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 17:57:45,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:57:45,622 INFO L93 Difference]: Finished difference Result 121 states and 149 transitions. [2021-11-25 17:57:45,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 17:57:45,623 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 45 [2021-11-25 17:57:45,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:57:45,624 INFO L225 Difference]: With dead ends: 121 [2021-11-25 17:57:45,625 INFO L226 Difference]: Without dead ends: 82 [2021-11-25 17:57:45,625 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 35 SyntacticMatches, 4 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-25 17:57:45,626 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 17 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 360 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 46 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:57:45,627 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 360 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 42 Invalid, 0 Unknown, 46 Unchecked, 0.1s Time] [2021-11-25 17:57:45,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-25 17:57:45,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 77. [2021-11-25 17:57:45,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 61 states have (on average 1.2295081967213115) internal successors, (75), 62 states have internal predecessors, (75), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 17:57:45,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 97 transitions. [2021-11-25 17:57:45,634 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 97 transitions. Word has length 45 [2021-11-25 17:57:45,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:57:45,635 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 97 transitions. [2021-11-25 17:57:45,635 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 17:57:45,635 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 97 transitions. [2021-11-25 17:57:45,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 17:57:45,636 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:57:45,637 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:57:45,652 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (7)] Ended with exit code 0 [2021-11-25 17:57:45,854 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:57:45,854 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:57:45,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:57:45,855 INFO L85 PathProgramCache]: Analyzing trace with hash 278782530, now seen corresponding path program 1 times [2021-11-25 17:57:45,855 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:57:45,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1518311271] [2021-11-25 17:57:45,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:57:45,856 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:57:45,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:57:45,857 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:57:45,857 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-25 17:57:46,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:57:46,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 17:57:46,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:57:46,898 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 17:57:46,899 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:57:46,899 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:57:46,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1518311271] [2021-11-25 17:57:46,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1518311271] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:57:46,899 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:57:46,899 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 17:57:46,899 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078223673] [2021-11-25 17:57:46,899 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:57:46,900 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 17:57:46,900 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:57:46,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 17:57:46,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 17:57:46,901 INFO L87 Difference]: Start difference. First operand 77 states and 97 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 17:57:47,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:57:47,020 INFO L93 Difference]: Finished difference Result 117 states and 144 transitions. [2021-11-25 17:57:47,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 17:57:47,021 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 45 [2021-11-25 17:57:47,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:57:47,022 INFO L225 Difference]: With dead ends: 117 [2021-11-25 17:57:47,022 INFO L226 Difference]: Without dead ends: 80 [2021-11-25 17:57:47,023 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 34 SyntacticMatches, 5 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-11-25 17:57:47,024 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 16 mSDsluCounter, 284 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 350 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 42 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:57:47,024 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 350 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 42 Unchecked, 0.1s Time] [2021-11-25 17:57:47,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-25 17:57:47,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2021-11-25 17:57:47,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 63 states have (on average 1.2222222222222223) internal successors, (77), 64 states have internal predecessors, (77), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 17:57:47,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 99 transitions. [2021-11-25 17:57:47,044 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 99 transitions. Word has length 45 [2021-11-25 17:57:47,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:57:47,045 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 99 transitions. [2021-11-25 17:57:47,045 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 17:57:47,045 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 99 transitions. [2021-11-25 17:57:47,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 17:57:47,047 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:57:47,047 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:57:47,062 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-25 17:57:47,251 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:57:47,252 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:57:47,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:57:47,252 INFO L85 PathProgramCache]: Analyzing trace with hash 979847108, now seen corresponding path program 1 times [2021-11-25 17:57:47,253 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:57:47,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [197895246] [2021-11-25 17:57:47,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:57:47,253 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:57:47,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:57:47,254 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:57:47,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-25 17:57:47,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:57:47,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 17:57:47,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:57:47,919 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 17:57:47,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:57:48,213 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 17:57:48,213 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:57:48,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [197895246] [2021-11-25 17:57:48,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [197895246] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 17:57:48,213 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:57:48,213 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 13 [2021-11-25 17:57:48,214 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836169761] [2021-11-25 17:57:48,215 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:57:48,216 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:57:48,216 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:57:48,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:57:48,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-11-25 17:57:48,217 INFO L87 Difference]: Start difference. First operand 79 states and 99 transitions. Second operand has 6 states, 6 states have (on average 5.333333333333333) internal successors, (32), 6 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 17:57:50,364 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 17:57:50,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:57:50,702 INFO L93 Difference]: Finished difference Result 140 states and 177 transitions. [2021-11-25 17:57:50,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 17:57:50,703 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.333333333333333) internal successors, (32), 6 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 45 [2021-11-25 17:57:50,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:57:50,704 INFO L225 Difference]: With dead ends: 140 [2021-11-25 17:57:50,704 INFO L226 Difference]: Without dead ends: 105 [2021-11-25 17:57:50,705 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2021-11-25 17:57:50,706 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 126 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 14 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 334 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 17:57:50,706 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [131 Valid, 334 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 40 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 17:57:50,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-25 17:57:50,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 93. [2021-11-25 17:57:50,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 77 states have (on average 1.2467532467532467) internal successors, (96), 78 states have internal predecessors, (96), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 17:57:50,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 118 transitions. [2021-11-25 17:57:50,715 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 118 transitions. Word has length 45 [2021-11-25 17:57:50,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:57:50,715 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 118 transitions. [2021-11-25 17:57:50,716 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.333333333333333) internal successors, (32), 6 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 17:57:50,716 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 118 transitions. [2021-11-25 17:57:50,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 17:57:50,717 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:57:50,717 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:57:50,733 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-25 17:57:50,927 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:57:50,928 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:57:50,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:57:50,928 INFO L85 PathProgramCache]: Analyzing trace with hash 1659905478, now seen corresponding path program 1 times [2021-11-25 17:57:50,928 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:57:50,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1842421787] [2021-11-25 17:57:50,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:57:50,929 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:57:50,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:57:50,930 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:57:50,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-25 17:57:51,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:57:51,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 17:57:51,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:57:51,457 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 17:57:51,457 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:57:51,457 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:57:51,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1842421787] [2021-11-25 17:57:51,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1842421787] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:57:51,457 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:57:51,457 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 17:57:51,458 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123473120] [2021-11-25 17:57:51,458 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:57:51,458 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:57:51,458 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:57:51,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:57:51,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:57:51,459 INFO L87 Difference]: Start difference. First operand 93 states and 118 transitions. Second operand has 6 states, 5 states have (on average 6.4) internal successors, (32), 5 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 17:57:51,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:57:51,616 INFO L93 Difference]: Finished difference Result 99 states and 123 transitions. [2021-11-25 17:57:51,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 17:57:51,617 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 6.4) internal successors, (32), 5 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 45 [2021-11-25 17:57:51,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:57:51,618 INFO L225 Difference]: With dead ends: 99 [2021-11-25 17:57:51,618 INFO L226 Difference]: Without dead ends: 97 [2021-11-25 17:57:51,618 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 17:57:51,619 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 32 mSDsluCounter, 230 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 301 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:57:51,619 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 301 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:57:51,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-25 17:57:51,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2021-11-25 17:57:51,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 80 states have (on average 1.2375) internal successors, (99), 81 states have internal predecessors, (99), 12 states have call successors, (12), 5 states have call predecessors, (12), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 17:57:51,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 121 transitions. [2021-11-25 17:57:51,628 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 121 transitions. Word has length 45 [2021-11-25 17:57:51,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:57:51,629 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 121 transitions. [2021-11-25 17:57:51,629 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 6.4) internal successors, (32), 5 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 17:57:51,629 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 121 transitions. [2021-11-25 17:57:51,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-25 17:57:51,631 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:57:51,631 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:57:51,648 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-25 17:57:51,844 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:57:51,845 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:57:51,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:57:51,845 INFO L85 PathProgramCache]: Analyzing trace with hash 990784662, now seen corresponding path program 1 times [2021-11-25 17:57:51,846 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:57:51,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1291142278] [2021-11-25 17:57:51,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:57:51,846 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:57:51,846 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:57:51,848 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:57:51,855 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-25 17:57:51,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:57:51,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 17:57:51,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:57:52,359 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 17:57:52,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:57:52,637 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:57:52,638 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:57:52,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1291142278] [2021-11-25 17:57:52,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1291142278] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 17:57:52,638 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:57:52,638 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 10 [2021-11-25 17:57:52,638 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067782678] [2021-11-25 17:57:52,638 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:57:52,639 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 17:57:52,639 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:57:52,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 17:57:52,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-25 17:57:52,639 INFO L87 Difference]: Start difference. First operand 97 states and 121 transitions. Second operand has 5 states, 5 states have (on average 8.0) internal successors, (40), 5 states have internal predecessors, (40), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-25 17:57:52,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:57:52,772 INFO L93 Difference]: Finished difference Result 131 states and 159 transitions. [2021-11-25 17:57:52,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 17:57:52,773 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.0) internal successors, (40), 5 states have internal predecessors, (40), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 62 [2021-11-25 17:57:52,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:57:52,774 INFO L225 Difference]: With dead ends: 131 [2021-11-25 17:57:52,775 INFO L226 Difference]: Without dead ends: 103 [2021-11-25 17:57:52,775 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-11-25 17:57:52,776 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 56 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 303 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:57:52,776 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 303 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:57:52,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-25 17:57:52,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 101. [2021-11-25 17:57:52,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 83 states have (on average 1.2289156626506024) internal successors, (102), 84 states have internal predecessors, (102), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 17:57:52,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 126 transitions. [2021-11-25 17:57:52,785 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 126 transitions. Word has length 62 [2021-11-25 17:57:52,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:57:52,785 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 126 transitions. [2021-11-25 17:57:52,785 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.0) internal successors, (40), 5 states have internal predecessors, (40), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-25 17:57:52,786 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 126 transitions. [2021-11-25 17:57:52,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 17:57:52,787 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:57:52,787 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:57:52,807 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-25 17:57:53,001 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:57:53,001 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:57:53,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:57:53,002 INFO L85 PathProgramCache]: Analyzing trace with hash 1705601977, now seen corresponding path program 1 times [2021-11-25 17:57:53,002 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:57:53,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [550205233] [2021-11-25 17:57:53,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:57:53,002 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:57:53,002 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:57:53,003 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:57:53,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-25 17:57:53,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:57:53,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 17:57:53,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:57:53,369 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 17:57:53,370 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:57:53,370 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:57:53,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [550205233] [2021-11-25 17:57:53,370 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [550205233] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:57:53,370 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:57:53,370 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 17:57:53,370 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319156326] [2021-11-25 17:57:53,370 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:57:53,371 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 17:57:53,371 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:57:53,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 17:57:53,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:57:53,372 INFO L87 Difference]: Start difference. First operand 101 states and 126 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-25 17:57:53,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:57:53,485 INFO L93 Difference]: Finished difference Result 182 states and 228 transitions. [2021-11-25 17:57:53,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 17:57:53,487 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 63 [2021-11-25 17:57:53,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:57:53,488 INFO L225 Difference]: With dead ends: 182 [2021-11-25 17:57:53,488 INFO L226 Difference]: Without dead ends: 115 [2021-11-25 17:57:53,489 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 17:57:53,490 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 5 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 17:57:53,490 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 133 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 17:57:53,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-25 17:57:53,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 113. [2021-11-25 17:57:53,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 95 states have (on average 1.1473684210526316) internal successors, (109), 96 states have internal predecessors, (109), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 17:57:53,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 133 transitions. [2021-11-25 17:57:53,500 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 133 transitions. Word has length 63 [2021-11-25 17:57:53,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:57:53,502 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 133 transitions. [2021-11-25 17:57:53,502 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-25 17:57:53,502 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 133 transitions. [2021-11-25 17:57:53,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 17:57:53,503 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:57:53,504 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:57:53,520 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-25 17:57:53,720 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:57:53,720 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:57:53,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:57:53,720 INFO L85 PathProgramCache]: Analyzing trace with hash -1560006021, now seen corresponding path program 1 times [2021-11-25 17:57:53,721 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:57:53,721 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [804026841] [2021-11-25 17:57:53,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:57:53,721 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:57:53,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:57:53,723 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:57:53,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-25 17:57:54,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:57:54,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 17:57:54,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:57:54,587 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 17:57:54,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:57:54,841 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:57:54,841 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:57:54,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [804026841] [2021-11-25 17:57:54,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [804026841] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 17:57:54,842 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:57:54,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [9] total 11 [2021-11-25 17:57:54,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930337912] [2021-11-25 17:57:54,842 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:57:54,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 17:57:54,843 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:57:54,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 17:57:54,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-11-25 17:57:54,843 INFO L87 Difference]: Start difference. First operand 113 states and 133 transitions. Second operand has 4 states, 4 states have (on average 10.25) internal successors, (41), 4 states have internal predecessors, (41), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-25 17:57:56,869 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 17:57:57,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:57:57,053 INFO L93 Difference]: Finished difference Result 164 states and 194 transitions. [2021-11-25 17:57:57,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 17:57:57,054 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.25) internal successors, (41), 4 states have internal predecessors, (41), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 63 [2021-11-25 17:57:57,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:57:57,055 INFO L225 Difference]: With dead ends: 164 [2021-11-25 17:57:57,055 INFO L226 Difference]: Without dead ends: 128 [2021-11-25 17:57:57,056 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-11-25 17:57:57,057 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 11 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:57:57,057 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 258 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 18 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2021-11-25 17:57:57,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-25 17:57:57,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 115. [2021-11-25 17:57:57,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 97 states have (on average 1.1443298969072164) internal successors, (111), 98 states have internal predecessors, (111), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 17:57:57,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 135 transitions. [2021-11-25 17:57:57,066 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 135 transitions. Word has length 63 [2021-11-25 17:57:57,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:57:57,066 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 135 transitions. [2021-11-25 17:57:57,066 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.25) internal successors, (41), 4 states have internal predecessors, (41), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-25 17:57:57,066 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 135 transitions. [2021-11-25 17:57:57,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 17:57:57,067 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:57:57,068 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:57:57,103 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (13)] Ended with exit code 0 [2021-11-25 17:57:57,303 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:57:57,304 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:57:57,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:57:57,304 INFO L85 PathProgramCache]: Analyzing trace with hash -1497966407, now seen corresponding path program 1 times [2021-11-25 17:57:57,305 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:57:57,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1642923918] [2021-11-25 17:57:57,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:57:57,305 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:57:57,305 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:57:57,306 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:57:57,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-25 17:57:57,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:57:57,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 17:57:57,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:57:57,884 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 17:57:57,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:57:58,193 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:57:58,193 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:57:58,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1642923918] [2021-11-25 17:57:58,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1642923918] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 17:57:58,193 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:57:58,194 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10] total 14 [2021-11-25 17:57:58,194 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302529036] [2021-11-25 17:57:58,194 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:57:58,194 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 17:57:58,195 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:57:58,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 17:57:58,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-11-25 17:57:58,195 INFO L87 Difference]: Start difference. First operand 115 states and 135 transitions. Second operand has 7 states, 7 states have (on average 5.857142857142857) internal successors, (41), 7 states have internal predecessors, (41), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 17:57:58,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:57:58,661 INFO L93 Difference]: Finished difference Result 220 states and 261 transitions. [2021-11-25 17:57:58,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 17:57:58,661 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.857142857142857) internal successors, (41), 7 states have internal predecessors, (41), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 63 [2021-11-25 17:57:58,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:57:58,663 INFO L225 Difference]: With dead ends: 220 [2021-11-25 17:57:58,663 INFO L226 Difference]: Without dead ends: 165 [2021-11-25 17:57:58,663 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-11-25 17:57:58,664 INFO L933 BasicCegarLoop]: 110 mSDtfsCounter, 121 mSDsluCounter, 251 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 361 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 17:57:58,664 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 361 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 17:57:58,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-11-25 17:57:58,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 121. [2021-11-25 17:57:58,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 102 states have (on average 1.1470588235294117) internal successors, (117), 103 states have internal predecessors, (117), 14 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-25 17:57:58,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 143 transitions. [2021-11-25 17:57:58,675 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 143 transitions. Word has length 63 [2021-11-25 17:57:58,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:57:58,675 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 143 transitions. [2021-11-25 17:57:58,676 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 5.857142857142857) internal successors, (41), 7 states have internal predecessors, (41), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 17:57:58,676 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 143 transitions. [2021-11-25 17:57:58,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 17:57:58,677 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:57:58,677 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:57:58,699 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-25 17:57:58,893 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:57:58,893 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:57:58,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:57:58,893 INFO L85 PathProgramCache]: Analyzing trace with hash 395834293, now seen corresponding path program 1 times [2021-11-25 17:57:58,894 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:57:58,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1249620905] [2021-11-25 17:57:58,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:57:58,894 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:57:58,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:57:58,895 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:57:58,897 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-25 17:57:59,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:57:59,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 17:57:59,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:57:59,831 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 17:57:59,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:00,515 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:00,515 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:58:00,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1249620905] [2021-11-25 17:58:00,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1249620905] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 17:58:00,515 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:58:00,516 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [11] total 17 [2021-11-25 17:58:00,516 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442634164] [2021-11-25 17:58:00,516 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:58:00,516 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 17:58:00,516 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:58:00,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 17:58:00,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-11-25 17:58:00,517 INFO L87 Difference]: Start difference. First operand 121 states and 143 transitions. Second operand has 9 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 17:58:01,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:58:01,058 INFO L93 Difference]: Finished difference Result 221 states and 262 transitions. [2021-11-25 17:58:01,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 17:58:01,059 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 63 [2021-11-25 17:58:01,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:58:01,060 INFO L225 Difference]: With dead ends: 221 [2021-11-25 17:58:01,060 INFO L226 Difference]: Without dead ends: 150 [2021-11-25 17:58:01,061 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 108 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2021-11-25 17:58:01,062 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 142 mSDsluCounter, 303 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 378 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 17:58:01,062 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [147 Valid, 378 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 17:58:01,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-11-25 17:58:01,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 115. [2021-11-25 17:58:01,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 96 states have (on average 1.1458333333333333) internal successors, (110), 97 states have internal predecessors, (110), 14 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-25 17:58:01,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 136 transitions. [2021-11-25 17:58:01,073 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 136 transitions. Word has length 63 [2021-11-25 17:58:01,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:58:01,074 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 136 transitions. [2021-11-25 17:58:01,074 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 17:58:01,074 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 136 transitions. [2021-11-25 17:58:01,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 17:58:01,075 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:01,075 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:58:01,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:01,296 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:58:01,296 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:58:01,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:01,297 INFO L85 PathProgramCache]: Analyzing trace with hash 1467507, now seen corresponding path program 1 times [2021-11-25 17:58:01,297 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:58:01,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1663683427] [2021-11-25 17:58:01,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:01,297 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:58:01,297 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:58:01,298 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:58:01,300 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-25 17:58:01,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:01,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 17:58:01,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:02,145 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 17:58:02,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:02,956 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:02,956 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:58:02,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1663683427] [2021-11-25 17:58:02,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1663683427] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 17:58:02,956 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:58:02,957 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [11] total 18 [2021-11-25 17:58:02,957 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236604682] [2021-11-25 17:58:02,957 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:58:02,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 17:58:02,958 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:58:02,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 17:58:02,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-11-25 17:58:02,958 INFO L87 Difference]: Start difference. First operand 115 states and 136 transitions. Second operand has 10 states, 10 states have (on average 4.1) internal successors, (41), 10 states have internal predecessors, (41), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 17:58:03,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:58:03,717 INFO L93 Difference]: Finished difference Result 197 states and 234 transitions. [2021-11-25 17:58:03,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 17:58:03,718 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.1) internal successors, (41), 10 states have internal predecessors, (41), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 63 [2021-11-25 17:58:03,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:58:03,720 INFO L225 Difference]: With dead ends: 197 [2021-11-25 17:58:03,720 INFO L226 Difference]: Without dead ends: 148 [2021-11-25 17:58:03,721 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=89, Invalid=373, Unknown=0, NotChecked=0, Total=462 [2021-11-25 17:58:03,721 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 109 mSDsluCounter, 430 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 534 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 17:58:03,722 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 534 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 17:58:03,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-25 17:58:03,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 117. [2021-11-25 17:58:03,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 98 states have (on average 1.1428571428571428) internal successors, (112), 99 states have internal predecessors, (112), 14 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-25 17:58:03,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 138 transitions. [2021-11-25 17:58:03,734 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 138 transitions. Word has length 63 [2021-11-25 17:58:03,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:58:03,734 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 138 transitions. [2021-11-25 17:58:03,734 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.1) internal successors, (41), 10 states have internal predecessors, (41), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 17:58:03,734 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 138 transitions. [2021-11-25 17:58:03,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 17:58:03,735 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:03,736 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:58:03,763 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:03,951 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:58:03,951 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:58:03,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:03,952 INFO L85 PathProgramCache]: Analyzing trace with hash 2052451505, now seen corresponding path program 1 times [2021-11-25 17:58:03,952 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:58:03,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1087508353] [2021-11-25 17:58:03,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:03,952 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:58:03,952 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:58:03,953 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:58:03,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-25 17:58:04,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:04,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 17:58:04,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:04,752 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 17:58:04,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:05,226 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:05,227 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:58:05,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1087508353] [2021-11-25 17:58:05,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1087508353] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 17:58:05,227 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:58:05,227 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [12] total 18 [2021-11-25 17:58:05,227 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986987487] [2021-11-25 17:58:05,227 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:58:05,228 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 17:58:05,228 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:58:05,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 17:58:05,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-11-25 17:58:05,229 INFO L87 Difference]: Start difference. First operand 117 states and 138 transitions. Second operand has 9 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 17:58:05,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:58:05,806 INFO L93 Difference]: Finished difference Result 193 states and 229 transitions. [2021-11-25 17:58:05,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 17:58:05,807 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 63 [2021-11-25 17:58:05,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:58:05,808 INFO L225 Difference]: With dead ends: 193 [2021-11-25 17:58:05,808 INFO L226 Difference]: Without dead ends: 146 [2021-11-25 17:58:05,808 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2021-11-25 17:58:05,809 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 175 mSDsluCounter, 277 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 17:58:05,809 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [180 Valid, 353 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 17:58:05,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-11-25 17:58:05,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 119. [2021-11-25 17:58:05,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 100 states have (on average 1.14) internal successors, (114), 101 states have internal predecessors, (114), 14 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-25 17:58:05,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 140 transitions. [2021-11-25 17:58:05,822 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 140 transitions. Word has length 63 [2021-11-25 17:58:05,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:58:05,823 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 140 transitions. [2021-11-25 17:58:05,823 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 17:58:05,823 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 140 transitions. [2021-11-25 17:58:05,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 17:58:05,825 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:05,825 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:58:05,844 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:06,044 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:58:06,045 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:58:06,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:06,045 INFO L85 PathProgramCache]: Analyzing trace with hash -1967756177, now seen corresponding path program 1 times [2021-11-25 17:58:06,046 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:58:06,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1861919536] [2021-11-25 17:58:06,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:06,046 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:58:06,046 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:58:06,047 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:58:06,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-25 17:58:06,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:06,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 17:58:06,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:06,789 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 17:58:06,789 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:07,217 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:07,217 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:58:07,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1861919536] [2021-11-25 17:58:07,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1861919536] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 17:58:07,217 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:58:07,217 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [12] total 18 [2021-11-25 17:58:07,218 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615582264] [2021-11-25 17:58:07,218 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:58:07,218 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 17:58:07,218 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:58:07,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 17:58:07,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-11-25 17:58:07,219 INFO L87 Difference]: Start difference. First operand 119 states and 140 transitions. Second operand has 9 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 17:58:07,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:58:07,727 INFO L93 Difference]: Finished difference Result 189 states and 224 transitions. [2021-11-25 17:58:07,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 17:58:07,728 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 63 [2021-11-25 17:58:07,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:58:07,729 INFO L225 Difference]: With dead ends: 189 [2021-11-25 17:58:07,729 INFO L226 Difference]: Without dead ends: 144 [2021-11-25 17:58:07,730 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2021-11-25 17:58:07,730 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 111 mSDsluCounter, 364 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 436 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 17:58:07,731 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 436 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 17:58:07,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-11-25 17:58:07,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 121. [2021-11-25 17:58:07,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 102 states have (on average 1.1372549019607843) internal successors, (116), 103 states have internal predecessors, (116), 14 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-25 17:58:07,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 142 transitions. [2021-11-25 17:58:07,743 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 142 transitions. Word has length 63 [2021-11-25 17:58:07,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:58:07,744 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 142 transitions. [2021-11-25 17:58:07,744 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 17:58:07,744 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 142 transitions. [2021-11-25 17:58:07,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 17:58:07,745 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:07,745 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:58:07,758 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:07,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:58:07,946 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:58:07,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:07,946 INFO L85 PathProgramCache]: Analyzing trace with hash -1945123923, now seen corresponding path program 1 times [2021-11-25 17:58:07,947 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:58:07,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1645829394] [2021-11-25 17:58:07,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:07,947 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:58:07,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:58:07,948 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:58:07,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-25 17:58:08,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:08,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 17:58:08,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:08,883 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 17:58:08,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:09,441 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:09,441 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:58:09,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1645829394] [2021-11-25 17:58:09,442 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1645829394] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 17:58:09,442 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:58:09,442 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [12] total 18 [2021-11-25 17:58:09,442 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873989830] [2021-11-25 17:58:09,442 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:58:09,443 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 17:58:09,443 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:58:09,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 17:58:09,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-11-25 17:58:09,444 INFO L87 Difference]: Start difference. First operand 121 states and 142 transitions. Second operand has 9 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 17:58:10,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:58:10,127 INFO L93 Difference]: Finished difference Result 186 states and 220 transitions. [2021-11-25 17:58:10,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 17:58:10,128 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 63 [2021-11-25 17:58:10,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:58:10,129 INFO L225 Difference]: With dead ends: 186 [2021-11-25 17:58:10,130 INFO L226 Difference]: Without dead ends: 143 [2021-11-25 17:58:10,130 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2021-11-25 17:58:10,131 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 136 mSDsluCounter, 348 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 446 SdHoareTripleChecker+Invalid, 226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 17:58:10,131 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [141 Valid, 446 Invalid, 226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 17:58:10,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-11-25 17:58:10,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 123. [2021-11-25 17:58:10,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 104 states have (on average 1.1346153846153846) internal successors, (118), 105 states have internal predecessors, (118), 14 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-25 17:58:10,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 144 transitions. [2021-11-25 17:58:10,144 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 144 transitions. Word has length 63 [2021-11-25 17:58:10,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:58:10,144 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 144 transitions. [2021-11-25 17:58:10,144 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 17:58:10,145 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 144 transitions. [2021-11-25 17:58:10,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 17:58:10,145 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:10,146 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:58:10,160 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:10,360 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:58:10,360 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:58:10,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:10,361 INFO L85 PathProgramCache]: Analyzing trace with hash 1840370283, now seen corresponding path program 1 times [2021-11-25 17:58:10,361 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:58:10,361 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [814561020] [2021-11-25 17:58:10,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:10,362 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:58:10,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:58:10,362 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:58:10,366 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-25 17:58:10,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:10,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 17:58:10,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:10,741 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 16 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 17:58:10,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:11,057 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:11,057 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:58:11,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [814561020] [2021-11-25 17:58:11,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [814561020] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 17:58:11,058 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:58:11,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7] total 12 [2021-11-25 17:58:11,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627619504] [2021-11-25 17:58:11,058 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:58:11,058 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 17:58:11,058 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:58:11,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 17:58:11,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-11-25 17:58:11,059 INFO L87 Difference]: Start difference. First operand 123 states and 144 transitions. Second operand has 7 states, 7 states have (on average 5.857142857142857) internal successors, (41), 7 states have internal predecessors, (41), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 17:58:12,986 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.80s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 17:58:15,005 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 17:58:16,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:58:16,709 INFO L93 Difference]: Finished difference Result 192 states and 230 transitions. [2021-11-25 17:58:16,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 17:58:16,710 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.857142857142857) internal successors, (41), 7 states have internal predecessors, (41), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 63 [2021-11-25 17:58:16,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:58:16,711 INFO L225 Difference]: With dead ends: 192 [2021-11-25 17:58:16,711 INFO L226 Difference]: Without dead ends: 156 [2021-11-25 17:58:16,712 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2021-11-25 17:58:16,712 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 104 mSDsluCounter, 374 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 26 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 495 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2021-11-25 17:58:16,713 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 495 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 62 Invalid, 1 Unknown, 0 Unchecked, 5.6s Time] [2021-11-25 17:58:16,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-11-25 17:58:16,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 125. [2021-11-25 17:58:16,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 106 states have (on average 1.1415094339622642) internal successors, (121), 107 states have internal predecessors, (121), 14 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-25 17:58:16,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 147 transitions. [2021-11-25 17:58:16,730 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 147 transitions. Word has length 63 [2021-11-25 17:58:16,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:58:16,730 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 147 transitions. [2021-11-25 17:58:16,731 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 5.857142857142857) internal successors, (41), 7 states have internal predecessors, (41), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 17:58:16,731 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 147 transitions. [2021-11-25 17:58:16,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 17:58:16,732 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:16,732 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:58:16,763 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:16,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:58:16,963 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:58:16,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:16,963 INFO L85 PathProgramCache]: Analyzing trace with hash 1435540623, now seen corresponding path program 1 times [2021-11-25 17:58:16,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:58:16,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1650894924] [2021-11-25 17:58:16,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:16,964 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:58:16,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:58:16,965 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:58:16,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-25 17:58:17,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:17,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 17:58:17,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:17,655 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 17:58:17,655 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:18,034 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 17:58:18,034 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:58:18,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1650894924] [2021-11-25 17:58:18,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1650894924] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 17:58:18,034 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:58:18,035 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10] total 15 [2021-11-25 17:58:18,035 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245657792] [2021-11-25 17:58:18,035 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:58:18,035 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 17:58:18,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:58:18,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 17:58:18,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-11-25 17:58:18,036 INFO L87 Difference]: Start difference. First operand 125 states and 147 transitions. Second operand has 7 states, 7 states have (on average 6.142857142857143) internal successors, (43), 7 states have internal predecessors, (43), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 17:58:20,153 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.94s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 17:58:20,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:58:20,400 INFO L93 Difference]: Finished difference Result 169 states and 195 transitions. [2021-11-25 17:58:20,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 17:58:20,401 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 6.142857142857143) internal successors, (43), 7 states have internal predecessors, (43), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 65 [2021-11-25 17:58:20,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:58:20,402 INFO L225 Difference]: With dead ends: 169 [2021-11-25 17:58:20,402 INFO L226 Difference]: Without dead ends: 108 [2021-11-25 17:58:20,402 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2021-11-25 17:58:20,403 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 141 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 290 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-25 17:58:20,403 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [146 Valid, 290 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-11-25 17:58:20,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-11-25 17:58:20,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 106. [2021-11-25 17:58:20,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 88 states have (on average 1.1477272727272727) internal successors, (101), 89 states have internal predecessors, (101), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 17:58:20,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 125 transitions. [2021-11-25 17:58:20,416 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 125 transitions. Word has length 65 [2021-11-25 17:58:20,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:58:20,416 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 125 transitions. [2021-11-25 17:58:20,416 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 6.142857142857143) internal successors, (43), 7 states have internal predecessors, (43), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 17:58:20,416 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 125 transitions. [2021-11-25 17:58:20,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 17:58:20,417 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:20,418 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:58:20,441 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:20,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:58:20,631 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:58:20,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:20,632 INFO L85 PathProgramCache]: Analyzing trace with hash 1286455351, now seen corresponding path program 1 times [2021-11-25 17:58:20,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:58:20,633 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [46464789] [2021-11-25 17:58:20,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:20,633 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:58:20,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:58:20,634 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:58:20,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-25 17:58:20,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:20,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 17:58:20,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:21,227 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 17:58:21,227 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:21,662 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:21,662 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:58:21,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [46464789] [2021-11-25 17:58:21,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [46464789] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:58:21,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [730601660] [2021-11-25 17:58:21,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:21,663 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:58:21,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:58:21,664 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:58:21,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-11-25 17:58:21,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:21,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 17:58:21,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:22,280 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 17:58:22,280 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:22,457 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:22,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [730601660] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:58:22,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2011137692] [2021-11-25 17:58:22,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:22,458 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:58:22,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:58:22,464 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:58:22,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-25 17:58:22,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:22,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 17:58:22,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:22,796 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 17:58:22,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:22,975 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:22,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2011137692] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:58:22,976 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 17:58:22,976 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 8, 8, 8, 8] total 19 [2021-11-25 17:58:22,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584883741] [2021-11-25 17:58:22,976 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 17:58:22,977 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 17:58:22,977 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:58:22,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 17:58:22,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2021-11-25 17:58:22,978 INFO L87 Difference]: Start difference. First operand 106 states and 125 transitions. Second operand has 19 states, 19 states have (on average 3.473684210526316) internal successors, (66), 18 states have internal predecessors, (66), 7 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (13), 8 states have call predecessors, (13), 7 states have call successors, (13) [2021-11-25 17:58:24,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:58:24,397 INFO L93 Difference]: Finished difference Result 262 states and 319 transitions. [2021-11-25 17:58:24,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-25 17:58:24,399 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.473684210526316) internal successors, (66), 18 states have internal predecessors, (66), 7 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (13), 8 states have call predecessors, (13), 7 states have call successors, (13) Word has length 65 [2021-11-25 17:58:24,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:58:24,400 INFO L225 Difference]: With dead ends: 262 [2021-11-25 17:58:24,400 INFO L226 Difference]: Without dead ends: 207 [2021-11-25 17:58:24,401 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 367 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=206, Invalid=664, Unknown=0, NotChecked=0, Total=870 [2021-11-25 17:58:24,402 INFO L933 BasicCegarLoop]: 113 mSDtfsCounter, 257 mSDsluCounter, 1099 mSDsCounter, 0 mSdLazyCounter, 389 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 1212 SdHoareTripleChecker+Invalid, 503 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 389 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 17:58:24,402 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [262 Valid, 1212 Invalid, 503 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 389 Invalid, 0 Unknown, 43 Unchecked, 0.9s Time] [2021-11-25 17:58:24,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2021-11-25 17:58:24,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 117. [2021-11-25 17:58:24,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 98 states have (on average 1.163265306122449) internal successors, (114), 99 states have internal predecessors, (114), 14 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-25 17:58:24,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 140 transitions. [2021-11-25 17:58:24,426 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 140 transitions. Word has length 65 [2021-11-25 17:58:24,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:58:24,426 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 140 transitions. [2021-11-25 17:58:24,426 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.473684210526316) internal successors, (66), 18 states have internal predecessors, (66), 7 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (13), 8 states have call predecessors, (13), 7 states have call successors, (13) [2021-11-25 17:58:24,426 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 140 transitions. [2021-11-25 17:58:24,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 17:58:24,427 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:24,428 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:58:24,447 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:24,646 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (23)] Ended with exit code 0 [2021-11-25 17:58:24,864 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:25,044 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:58:25,044 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:58:25,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:25,044 INFO L85 PathProgramCache]: Analyzing trace with hash -1114711245, now seen corresponding path program 1 times [2021-11-25 17:58:25,045 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:58:25,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1382083535] [2021-11-25 17:58:25,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:25,045 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:58:25,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:58:25,047 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:58:25,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-25 17:58:25,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:25,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 17:58:25,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:25,899 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 17:58:25,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:26,705 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:26,705 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:58:26,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1382083535] [2021-11-25 17:58:26,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1382083535] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:58:26,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [452228813] [2021-11-25 17:58:26,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:26,706 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:58:26,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:58:26,714 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:58:26,721 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-25 17:58:27,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:27,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 17:58:27,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:27,497 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 17:58:27,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:28,134 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:28,134 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [452228813] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:58:28,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1765211496] [2021-11-25 17:58:28,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:28,135 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:58:28,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:58:28,135 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:58:28,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-25 17:58:28,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:28,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 17:58:28,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:28,501 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 17:58:28,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:28,677 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:28,677 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1765211496] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:58:28,677 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 17:58:28,677 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 10, 10, 10, 10] total 29 [2021-11-25 17:58:28,677 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865281420] [2021-11-25 17:58:28,678 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 17:58:28,678 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 17:58:28,678 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:58:28,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 17:58:28,679 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=681, Unknown=0, NotChecked=0, Total=812 [2021-11-25 17:58:28,679 INFO L87 Difference]: Start difference. First operand 117 states and 140 transitions. Second operand has 29 states, 29 states have (on average 2.9310344827586206) internal successors, (85), 28 states have internal predecessors, (85), 9 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (15), 10 states have call predecessors, (15), 9 states have call successors, (15) [2021-11-25 17:58:30,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:58:30,014 INFO L93 Difference]: Finished difference Result 183 states and 215 transitions. [2021-11-25 17:58:30,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 17:58:30,016 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.9310344827586206) internal successors, (85), 28 states have internal predecessors, (85), 9 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (15), 10 states have call predecessors, (15), 9 states have call successors, (15) Word has length 65 [2021-11-25 17:58:30,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:58:30,017 INFO L225 Difference]: With dead ends: 183 [2021-11-25 17:58:30,017 INFO L226 Difference]: Without dead ends: 130 [2021-11-25 17:58:30,018 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 357 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 343 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=324, Invalid=1236, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 17:58:30,019 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 120 mSDsluCounter, 951 mSDsCounter, 0 mSdLazyCounter, 255 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 1018 SdHoareTripleChecker+Invalid, 357 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 65 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 17:58:30,019 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 1018 Invalid, 357 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 255 Invalid, 0 Unknown, 65 Unchecked, 0.5s Time] [2021-11-25 17:58:30,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-25 17:58:30,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 128. [2021-11-25 17:58:30,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 108 states have (on average 1.1574074074074074) internal successors, (125), 109 states have internal predecessors, (125), 15 states have call successors, (15), 5 states have call predecessors, (15), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-25 17:58:30,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 153 transitions. [2021-11-25 17:58:30,032 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 153 transitions. Word has length 65 [2021-11-25 17:58:30,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:58:30,033 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 153 transitions. [2021-11-25 17:58:30,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.9310344827586206) internal successors, (85), 28 states have internal predecessors, (85), 9 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (15), 10 states have call predecessors, (15), 9 states have call successors, (15) [2021-11-25 17:58:30,033 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 153 transitions. [2021-11-25 17:58:30,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 17:58:30,034 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:30,034 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:58:30,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:30,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:30,459 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-11-25 17:58:30,638 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:58:30,639 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:58:30,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:30,639 INFO L85 PathProgramCache]: Analyzing trace with hash -1509078031, now seen corresponding path program 1 times [2021-11-25 17:58:30,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:58:30,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1941207370] [2021-11-25 17:58:30,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:30,640 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:58:30,640 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:58:30,642 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:58:30,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-25 17:58:30,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:30,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 17:58:30,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:31,789 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 17:58:31,789 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:32,889 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:32,889 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:58:32,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1941207370] [2021-11-25 17:58:32,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1941207370] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:58:32,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [638973188] [2021-11-25 17:58:32,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:32,890 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:58:32,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:58:32,890 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:58:32,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-25 17:58:33,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:33,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 17:58:33,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:33,981 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 17:58:33,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:34,660 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:34,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [638973188] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:58:34,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1239901222] [2021-11-25 17:58:34,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:34,661 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:58:34,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:58:34,687 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:58:34,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-25 17:58:34,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:34,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 17:58:34,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:35,373 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 17:58:35,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:35,627 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:35,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1239901222] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:58:35,627 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 17:58:35,627 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 10, 10, 10, 10] total 37 [2021-11-25 17:58:35,627 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597669662] [2021-11-25 17:58:35,627 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 17:58:35,628 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-25 17:58:35,628 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:58:35,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-25 17:58:35,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=1127, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 17:58:35,633 INFO L87 Difference]: Start difference. First operand 128 states and 153 transitions. Second operand has 37 states, 37 states have (on average 2.864864864864865) internal successors, (106), 36 states have internal predecessors, (106), 11 states have call successors, (17), 2 states have call predecessors, (17), 3 states have return successors, (17), 12 states have call predecessors, (17), 11 states have call successors, (17) [2021-11-25 17:58:38,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:58:38,104 INFO L93 Difference]: Finished difference Result 250 states and 302 transitions. [2021-11-25 17:58:38,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-25 17:58:38,105 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.864864864864865) internal successors, (106), 36 states have internal predecessors, (106), 11 states have call successors, (17), 2 states have call predecessors, (17), 3 states have return successors, (17), 12 states have call predecessors, (17), 11 states have call successors, (17) Word has length 65 [2021-11-25 17:58:38,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:58:38,106 INFO L225 Difference]: With dead ends: 250 [2021-11-25 17:58:38,106 INFO L226 Difference]: Without dead ends: 201 [2021-11-25 17:58:38,108 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 347 SyntacticMatches, 5 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 804 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=500, Invalid=2256, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 17:58:38,108 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 325 mSDsluCounter, 1348 mSDsCounter, 0 mSdLazyCounter, 591 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 330 SdHoareTripleChecker+Valid, 1416 SdHoareTripleChecker+Invalid, 851 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 591 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 161 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-25 17:58:38,109 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [330 Valid, 1416 Invalid, 851 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 591 Invalid, 0 Unknown, 161 Unchecked, 1.2s Time] [2021-11-25 17:58:38,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-11-25 17:58:38,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 130. [2021-11-25 17:58:38,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 110 states have (on average 1.1545454545454545) internal successors, (127), 111 states have internal predecessors, (127), 15 states have call successors, (15), 5 states have call predecessors, (15), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-25 17:58:38,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 155 transitions. [2021-11-25 17:58:38,125 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 155 transitions. Word has length 65 [2021-11-25 17:58:38,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:58:38,125 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 155 transitions. [2021-11-25 17:58:38,125 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.864864864864865) internal successors, (106), 36 states have internal predecessors, (106), 11 states have call successors, (17), 2 states have call predecessors, (17), 3 states have return successors, (17), 12 states have call predecessors, (17), 11 states have call successors, (17) [2021-11-25 17:58:38,125 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 155 transitions. [2021-11-25 17:58:38,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 17:58:38,126 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:38,127 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:58:38,153 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:38,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:38,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (29)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:38,736 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 17:58:38,736 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:58:38,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:38,736 INFO L85 PathProgramCache]: Analyzing trace with hash 541905967, now seen corresponding path program 1 times [2021-11-25 17:58:38,737 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:58:38,737 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1181304316] [2021-11-25 17:58:38,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:38,737 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:58:38,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:58:38,738 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:58:38,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-25 17:58:38,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:38,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 17:58:38,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:39,533 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 17:58:39,533 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:40,108 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:40,108 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:58:40,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1181304316] [2021-11-25 17:58:40,108 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1181304316] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:58:40,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2122090642] [2021-11-25 17:58:40,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:40,108 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:58:40,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:58:40,109 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:58:40,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-25 17:58:40,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:40,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 17:58:40,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:40,790 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 17:58:40,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:40,992 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:40,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2122090642] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:58:40,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1872427514] [2021-11-25 17:58:40,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:40,993 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:58:40,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:58:40,995 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:58:41,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-25 17:58:41,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:41,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 17:58:41,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:41,396 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 17:58:41,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:41,585 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:41,586 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1872427514] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:58:41,586 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 17:58:41,586 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 10, 10, 10, 10] total 23 [2021-11-25 17:58:41,586 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811428861] [2021-11-25 17:58:41,586 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 17:58:41,587 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 17:58:41,587 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:58:41,587 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 17:58:41,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=421, Unknown=0, NotChecked=0, Total=506 [2021-11-25 17:58:41,588 INFO L87 Difference]: Start difference. First operand 130 states and 155 transitions. Second operand has 23 states, 23 states have (on average 3.217391304347826) internal successors, (74), 22 states have internal predecessors, (74), 7 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (13), 8 states have call predecessors, (13), 7 states have call successors, (13) [2021-11-25 17:58:43,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:58:43,183 INFO L93 Difference]: Finished difference Result 257 states and 308 transitions. [2021-11-25 17:58:43,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 17:58:43,184 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.217391304347826) internal successors, (74), 22 states have internal predecessors, (74), 7 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (13), 8 states have call predecessors, (13), 7 states have call successors, (13) Word has length 65 [2021-11-25 17:58:43,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:58:43,186 INFO L225 Difference]: With dead ends: 257 [2021-11-25 17:58:43,186 INFO L226 Difference]: Without dead ends: 210 [2021-11-25 17:58:43,187 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 363 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=222, Invalid=900, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 17:58:43,187 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 228 mSDsluCounter, 1152 mSDsCounter, 0 mSdLazyCounter, 435 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 1263 SdHoareTripleChecker+Invalid, 618 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 435 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 97 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 17:58:43,188 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [233 Valid, 1263 Invalid, 618 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 435 Invalid, 0 Unknown, 97 Unchecked, 1.0s Time] [2021-11-25 17:58:43,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2021-11-25 17:58:43,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 143. [2021-11-25 17:58:43,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 122 states have (on average 1.139344262295082) internal successors, (139), 123 states have internal predecessors, (139), 16 states have call successors, (16), 5 states have call predecessors, (16), 4 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-25 17:58:43,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 169 transitions. [2021-11-25 17:58:43,205 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 169 transitions. Word has length 65 [2021-11-25 17:58:43,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:58:43,205 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 169 transitions. [2021-11-25 17:58:43,205 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 3.217391304347826) internal successors, (74), 22 states have internal predecessors, (74), 7 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (13), 8 states have call predecessors, (13), 7 states have call successors, (13) [2021-11-25 17:58:43,206 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 169 transitions. [2021-11-25 17:58:43,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 17:58:43,207 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:43,207 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:58:43,226 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:43,460 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:43,630 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (32)] Ended with exit code 0 [2021-11-25 17:58:43,827 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 17:58:43,827 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:58:43,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:43,827 INFO L85 PathProgramCache]: Analyzing trace with hash 816665581, now seen corresponding path program 1 times [2021-11-25 17:58:43,828 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:58:43,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1055014304] [2021-11-25 17:58:43,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:43,828 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:58:43,828 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:58:43,829 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:58:43,830 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-25 17:58:44,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:44,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 17:58:44,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:44,784 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 17:58:44,784 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:45,382 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:45,382 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:58:45,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1055014304] [2021-11-25 17:58:45,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1055014304] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:58:45,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [840715193] [2021-11-25 17:58:45,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:45,383 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:58:45,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:58:45,384 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:58:45,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2021-11-25 17:58:45,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:45,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 17:58:45,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:46,526 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 17:58:46,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:46,786 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:46,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [840715193] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:58:46,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1806293265] [2021-11-25 17:58:46,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:46,787 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:58:46,787 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:58:46,811 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:58:46,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-25 17:58:47,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:47,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 17:58:47,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:47,361 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 17:58:47,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:58:47,538 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 17:58:47,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1806293265] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 17:58:47,538 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 17:58:47,539 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 10, 10, 10, 10] total 30 [2021-11-25 17:58:47,539 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67742824] [2021-11-25 17:58:47,539 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 17:58:47,539 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-25 17:58:47,540 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 17:58:47,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-25 17:58:47,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=736, Unknown=0, NotChecked=0, Total=870 [2021-11-25 17:58:47,541 INFO L87 Difference]: Start difference. First operand 143 states and 169 transitions. Second operand has 30 states, 30 states have (on average 3.1666666666666665) internal successors, (95), 29 states have internal predecessors, (95), 9 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (15), 10 states have call predecessors, (15), 9 states have call successors, (15) [2021-11-25 17:58:48,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:58:48,753 INFO L93 Difference]: Finished difference Result 229 states and 269 transitions. [2021-11-25 17:58:48,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 17:58:48,754 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.1666666666666665) internal successors, (95), 29 states have internal predecessors, (95), 9 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (15), 10 states have call predecessors, (15), 9 states have call successors, (15) Word has length 65 [2021-11-25 17:58:48,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:58:48,755 INFO L225 Difference]: With dead ends: 229 [2021-11-25 17:58:48,755 INFO L226 Difference]: Without dead ends: 184 [2021-11-25 17:58:48,756 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 393 GetRequests, 356 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 376 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=249, Invalid=1233, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 17:58:48,757 INFO L933 BasicCegarLoop]: 89 mSDtfsCounter, 158 mSDsluCounter, 1072 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 1161 SdHoareTripleChecker+Invalid, 474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 61 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 17:58:48,757 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [163 Valid, 1161 Invalid, 474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 369 Invalid, 0 Unknown, 61 Unchecked, 0.7s Time] [2021-11-25 17:58:48,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-11-25 17:58:48,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 151. [2021-11-25 17:58:48,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 130 states have (on average 1.1307692307692307) internal successors, (147), 131 states have internal predecessors, (147), 16 states have call successors, (16), 5 states have call predecessors, (16), 4 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-25 17:58:48,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 177 transitions. [2021-11-25 17:58:48,769 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 177 transitions. Word has length 65 [2021-11-25 17:58:48,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:58:48,770 INFO L470 AbstractCegarLoop]: Abstraction has 151 states and 177 transitions. [2021-11-25 17:58:48,770 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 3.1666666666666665) internal successors, (95), 29 states have internal predecessors, (95), 9 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (15), 10 states have call predecessors, (15), 9 states have call successors, (15) [2021-11-25 17:58:48,770 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 177 transitions. [2021-11-25 17:58:48,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 17:58:48,771 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:58:48,771 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:58:48,798 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:48,990 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (35)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:49,197 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2021-11-25 17:58:49,387 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 17:58:49,388 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:58:49,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:58:49,388 INFO L85 PathProgramCache]: Analyzing trace with hash 839297835, now seen corresponding path program 1 times [2021-11-25 17:58:49,388 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 17:58:49,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [739065523] [2021-11-25 17:58:49,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:58:49,389 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 17:58:49,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 17:58:49,389 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 17:58:49,391 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-25 17:58:49,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:58:49,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-25 17:58:49,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:58:49,645 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 18 treesize of output 16 [2021-11-25 17:58:50,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 17:58:52,205 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-25 17:58:54,777 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_assert_bytes_match_~b#1.base_BEFORE_CALL_2| (_ BitVec 64)) (|ULTIMATE.start_memset_using_uint64_impl_~c#1| (_ BitVec 32)) (|v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_2| (_ BitVec 64))) (let ((.cse0 ((_ extract 7 0) |ULTIMATE.start_memset_using_uint64_impl_~c#1|))) (and (not (= |v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_2| |v_ULTIMATE.start_assert_bytes_match_~b#1.base_BEFORE_CALL_2|)) (= (select (select |c_#memory_int| |v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_2|) (_ bv0 64)) .cse0) (= (select (select |c_#memory_int| |v_ULTIMATE.start_assert_bytes_match_~b#1.base_BEFORE_CALL_2|) (_ bv0 64)) .cse0)))) is different from true [2021-11-25 17:58:57,252 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_assert_bytes_match_~b#1.base_BEFORE_CALL_3| (_ BitVec 64)) (|ULTIMATE.start_memset_using_uint64_impl_~c#1| (_ BitVec 32)) (|v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_3| (_ BitVec 64))) (let ((.cse0 ((_ extract 7 0) |ULTIMATE.start_memset_using_uint64_impl_~c#1|))) (and (= (select (select |c_#memory_int| |v_ULTIMATE.start_assert_bytes_match_~b#1.base_BEFORE_CALL_3|) (_ bv0 64)) .cse0) (not (= |v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_3| |v_ULTIMATE.start_assert_bytes_match_~b#1.base_BEFORE_CALL_3|)) (= (select (select |c_#memory_int| |v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_3|) (_ bv0 64)) .cse0)))) is different from true [2021-11-25 17:58:59,663 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_assert_bytes_match_~b#1.base_BEFORE_CALL_4| (_ BitVec 64)) (|ULTIMATE.start_memset_using_uint64_impl_~c#1| (_ BitVec 32)) (|v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_4| (_ BitVec 64))) (let ((.cse0 ((_ extract 7 0) |ULTIMATE.start_memset_using_uint64_impl_~c#1|))) (and (= .cse0 (select (select |c_#memory_int| |v_ULTIMATE.start_assert_bytes_match_~b#1.base_BEFORE_CALL_4|) (_ bv0 64))) (not (= |v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_4| |v_ULTIMATE.start_assert_bytes_match_~b#1.base_BEFORE_CALL_4|)) (= .cse0 (select (select |c_#memory_int| |v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_4|) (_ bv0 64)))))) is different from true [2021-11-25 17:59:08,340 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 17:59:08,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 15 [2021-11-25 17:59:08,704 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 2 not checked. [2021-11-25 17:59:08,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:59:09,985 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 17:59:09,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [739065523] [2021-11-25 17:59:09,985 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [739065523] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:59:09,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1365750638] [2021-11-25 17:59:09,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:59:09,986 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 17:59:09,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 17:59:09,989 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 17:59:09,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-25 17:59:10,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:59:10,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-25 17:59:10,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:59:10,578 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 18 treesize of output 16 [2021-11-25 17:59:11,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 17:59:11,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 21 [2021-11-25 17:59:13,963 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 17:59:13,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 30 [2021-11-25 18:00:17,659 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:00:17,667 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:00:17,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 2 disjoint index pairs (out of 10 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 38 treesize of output 18 [2021-11-25 18:00:17,848 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:00:17,848 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:00:17,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1365750638] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:00:17,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2125068095] [2021-11-25 18:00:17,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:00:17,942 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:00:17,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:00:17,943 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:00:17,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-25 18:00:18,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:00:18,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-25 18:00:18,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:00:18,206 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 18 treesize of output 16 [2021-11-25 18:00:19,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 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 [2021-11-25 18:00:23,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-25 18:00:26,974 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_8| (_ BitVec 64)) (|v_ULTIMATE.start_assert_bytes_match_~b#1.base_BEFORE_CALL_8| (_ BitVec 64)) (|ULTIMATE.start_memset_using_uint64_impl_~c#1| (_ BitVec 32))) (let ((.cse0 ((_ extract 7 0) |ULTIMATE.start_memset_using_uint64_impl_~c#1|))) (and (= (select (select |c_#memory_int| |v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_8|) (_ bv0 64)) .cse0) (not (= |v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_8| |v_ULTIMATE.start_assert_bytes_match_~b#1.base_BEFORE_CALL_8|)) (not (= (_ bv0 64) |v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_8|)) (= (select (select |c_#memory_int| |v_ULTIMATE.start_assert_bytes_match_~b#1.base_BEFORE_CALL_8|) (_ bv0 64)) .cse0)))) is different from true [2021-11-25 18:00:29,719 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_9| (_ BitVec 64)) (|ULTIMATE.start_memset_using_uint64_impl_~c#1| (_ BitVec 32)) (|v_ULTIMATE.start_assert_bytes_match_~b#1.base_BEFORE_CALL_9| (_ BitVec 64))) (let ((.cse0 ((_ extract 7 0) |ULTIMATE.start_memset_using_uint64_impl_~c#1|))) (and (not (= (_ bv0 64) |v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_9|)) (= .cse0 (select (select |c_#memory_int| |v_ULTIMATE.start_assert_bytes_match_~b#1.base_BEFORE_CALL_9|) (_ bv0 64))) (= .cse0 (select (select |c_#memory_int| |v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_9|) (_ bv0 64))) (not (= |v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_9| |v_ULTIMATE.start_assert_bytes_match_~b#1.base_BEFORE_CALL_9|))))) is different from true [2021-11-25 18:00:32,462 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_10| (_ BitVec 64)) (|v_ULTIMATE.start_assert_bytes_match_~b#1.base_BEFORE_CALL_10| (_ BitVec 64)) (|ULTIMATE.start_memset_using_uint64_impl_~c#1| (_ BitVec 32))) (let ((.cse0 ((_ extract 7 0) |ULTIMATE.start_memset_using_uint64_impl_~c#1|))) (and (= (select (select |c_#memory_int| |v_ULTIMATE.start_assert_bytes_match_~b#1.base_BEFORE_CALL_10|) (_ bv0 64)) .cse0) (not (= |v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_10| |v_ULTIMATE.start_assert_bytes_match_~b#1.base_BEFORE_CALL_10|)) (not (= (_ bv0 64) |v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_10|)) (= (select (select |c_#memory_int| |v_ULTIMATE.start_assert_bytes_match_~a#1.base_BEFORE_CALL_10|) (_ bv0 64)) .cse0)))) is different from true [2021-11-25 18:00:35,356 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:00:35,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 15 [2021-11-25 18:00:35,537 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 2 not checked. [2021-11-25 18:00:35,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:00:35,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2125068095] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:00:35,623 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:00:35,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 19, 26] total 59 [2021-11-25 18:00:35,623 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489868097] [2021-11-25 18:00:35,624 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:00:35,624 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-25 18:00:35,624 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:00:35,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-25 18:00:35,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=2938, Unknown=17, NotChecked=690, Total=3906 [2021-11-25 18:00:35,627 INFO L87 Difference]: Start difference. First operand 151 states and 177 transitions. Second operand has 59 states, 55 states have (on average 2.3454545454545452) internal successors, (129), 51 states have internal predecessors, (129), 14 states have call successors, (20), 10 states have call predecessors, (20), 10 states have return successors, (18), 15 states have call predecessors, (18), 12 states have call successors, (18) [2021-11-25 18:01:26,988 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:01:44,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:01:44,746 INFO L93 Difference]: Finished difference Result 283 states and 337 transitions. [2021-11-25 18:01:44,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-25 18:01:44,747 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 55 states have (on average 2.3454545454545452) internal successors, (129), 51 states have internal predecessors, (129), 14 states have call successors, (20), 10 states have call predecessors, (20), 10 states have return successors, (18), 15 states have call predecessors, (18), 12 states have call successors, (18) Word has length 65 [2021-11-25 18:01:44,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:01:44,751 INFO L225 Difference]: With dead ends: 283 [2021-11-25 18:01:44,751 INFO L226 Difference]: Without dead ends: 230 [2021-11-25 18:01:44,753 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 138 SyntacticMatches, 20 SemanticMatches, 85 ConstructedPredicates, 6 IntricatePredicates, 1 DeprecatedPredicates, 2483 ImplicationChecksByTransitivity, 161.1s TimeCoverageRelationStatistics Valid=686, Invalid=5778, Unknown=40, NotChecked=978, Total=7482 [2021-11-25 18:01:44,754 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 427 mSDsluCounter, 1705 mSDsCounter, 0 mSdLazyCounter, 990 mSolverCounterSat, 215 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 432 SdHoareTripleChecker+Valid, 1804 SdHoareTripleChecker+Invalid, 2813 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 990 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 1607 IncrementalHoareTripleChecker+Unchecked, 5.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:01:44,754 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [432 Valid, 1804 Invalid, 2813 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 990 Invalid, 1 Unknown, 1607 Unchecked, 5.8s Time] [2021-11-25 18:01:44,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2021-11-25 18:01:44,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 185. [2021-11-25 18:01:44,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 155 states have (on average 1.1290322580645162) internal successors, (175), 157 states have internal predecessors, (175), 20 states have call successors, (20), 10 states have call predecessors, (20), 9 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-25 18:01:44,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 213 transitions. [2021-11-25 18:01:44,781 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 213 transitions. Word has length 65 [2021-11-25 18:01:44,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:01:44,787 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 213 transitions. [2021-11-25 18:01:44,787 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 55 states have (on average 2.3454545454545452) internal successors, (129), 51 states have internal predecessors, (129), 14 states have call successors, (20), 10 states have call predecessors, (20), 10 states have return successors, (18), 15 states have call predecessors, (18), 12 states have call successors, (18) [2021-11-25 18:01:44,787 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 213 transitions. [2021-11-25 18:01:44,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 18:01:44,788 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:01:44,789 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:01:44,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-25 18:01:45,023 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-25 18:01:45,204 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (38)] Ended with exit code 0 [2021-11-25 18:01:45,402 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 18:01:45,402 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:01:45,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:01:45,403 INFO L85 PathProgramCache]: Analyzing trace with hash 329824745, now seen corresponding path program 1 times [2021-11-25 18:01:45,403 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:01:45,403 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1395796659] [2021-11-25 18:01:45,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:01:45,403 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:01:45,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:01:45,404 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:01:45,405 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-25 18:01:45,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:01:45,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 18:01:45,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:01:46,320 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 18:01:46,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:01:47,218 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:01:47,218 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:01:47,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1395796659] [2021-11-25 18:01:47,218 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1395796659] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:01:47,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [236735776] [2021-11-25 18:01:47,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:01:47,219 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:01:47,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:01:47,219 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:01:47,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-11-25 18:01:47,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:01:47,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 18:01:47,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:01:48,221 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 18:01:48,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:01:48,933 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:01:48,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [236735776] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:01:48,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1568573109] [2021-11-25 18:01:48,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:01:48,933 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:01:48,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:01:48,934 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:01:48,936 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-25 18:01:49,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:01:49,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 18:01:49,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:01:49,452 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 18:01:49,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:01:49,846 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:01:49,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1568573109] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:01:49,847 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:01:49,847 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 9, 9, 10, 10] total 34 [2021-11-25 18:01:49,847 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226858163] [2021-11-25 18:01:49,847 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:01:49,848 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-25 18:01:49,848 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:01:49,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-25 18:01:49,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=970, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 18:01:49,849 INFO L87 Difference]: Start difference. First operand 185 states and 213 transitions. Second operand has 34 states, 34 states have (on average 3.588235294117647) internal successors, (122), 33 states have internal predecessors, (122), 9 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (15), 10 states have call predecessors, (15), 9 states have call successors, (15) [2021-11-25 18:01:52,207 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.27s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:02:04,381 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:02:14,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:14,483 INFO L93 Difference]: Finished difference Result 245 states and 284 transitions. [2021-11-25 18:02:14,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-25 18:02:14,484 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.588235294117647) internal successors, (122), 33 states have internal predecessors, (122), 9 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (15), 10 states have call predecessors, (15), 9 states have call successors, (15) Word has length 65 [2021-11-25 18:02:14,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:14,485 INFO L225 Difference]: With dead ends: 245 [2021-11-25 18:02:14,485 INFO L226 Difference]: Without dead ends: 202 [2021-11-25 18:02:14,486 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 392 GetRequests, 350 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 511 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=255, Invalid=1467, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 18:02:14,486 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 118 mSDsluCounter, 1304 mSDsCounter, 0 mSdLazyCounter, 504 mSolverCounterSat, 40 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 23.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 1385 SdHoareTripleChecker+Invalid, 678 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 504 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 133 IncrementalHoareTripleChecker+Unchecked, 23.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:14,487 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [118 Valid, 1385 Invalid, 678 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 504 Invalid, 1 Unknown, 133 Unchecked, 23.7s Time] [2021-11-25 18:02:14,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-11-25 18:02:14,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 185. [2021-11-25 18:02:14,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 155 states have (on average 1.1225806451612903) internal successors, (174), 157 states have internal predecessors, (174), 20 states have call successors, (20), 10 states have call predecessors, (20), 9 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-25 18:02:14,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 212 transitions. [2021-11-25 18:02:14,515 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 212 transitions. Word has length 65 [2021-11-25 18:02:14,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:14,515 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 212 transitions. [2021-11-25 18:02:14,515 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 3.588235294117647) internal successors, (122), 33 states have internal predecessors, (122), 9 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (15), 10 states have call predecessors, (15), 9 states have call successors, (15) [2021-11-25 18:02:14,515 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 212 transitions. [2021-11-25 18:02:14,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-25 18:02:14,516 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:14,516 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:02:14,537 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:14,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (41)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:14,926 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (40)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:15,117 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 18:02:15,117 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:02:15,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:15,117 INFO L85 PathProgramCache]: Analyzing trace with hash -1592252509, now seen corresponding path program 1 times [2021-11-25 18:02:15,118 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:02:15,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1329523535] [2021-11-25 18:02:15,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:15,118 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:02:15,118 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:02:15,119 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:02:15,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-25 18:02:15,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:15,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:02:15,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:15,705 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:02:15,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:02:15,999 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:02:15,999 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:02:15,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1329523535] [2021-11-25 18:02:15,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1329523535] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 18:02:15,999 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:02:15,999 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 12 [2021-11-25 18:02:15,999 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540277410] [2021-11-25 18:02:15,999 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:02:16,000 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:02:16,000 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:02:16,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:02:16,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-25 18:02:16,000 INFO L87 Difference]: Start difference. First operand 185 states and 212 transitions. Second operand has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 5 states have internal predecessors, (43), 4 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 18:02:16,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:16,150 INFO L93 Difference]: Finished difference Result 207 states and 233 transitions. [2021-11-25 18:02:16,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:02:16,150 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 5 states have internal predecessors, (43), 4 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 66 [2021-11-25 18:02:16,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:16,152 INFO L225 Difference]: With dead ends: 207 [2021-11-25 18:02:16,152 INFO L226 Difference]: Without dead ends: 160 [2021-11-25 18:02:16,152 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-11-25 18:02:16,153 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 68 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:16,153 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 288 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:02:16,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-11-25 18:02:16,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2021-11-25 18:02:16,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 132 states have (on average 1.1363636363636365) internal successors, (150), 134 states have internal predecessors, (150), 18 states have call successors, (18), 10 states have call predecessors, (18), 9 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-25 18:02:16,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 184 transitions. [2021-11-25 18:02:16,171 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 184 transitions. Word has length 66 [2021-11-25 18:02:16,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:16,171 INFO L470 AbstractCegarLoop]: Abstraction has 160 states and 184 transitions. [2021-11-25 18:02:16,171 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 5 states have internal predecessors, (43), 4 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 18:02:16,171 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 184 transitions. [2021-11-25 18:02:16,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-25 18:02:16,172 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:16,172 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:02:16,183 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:16,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 18:02:16,375 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:02:16,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:16,376 INFO L85 PathProgramCache]: Analyzing trace with hash 1477592399, now seen corresponding path program 1 times [2021-11-25 18:02:16,376 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:02:16,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1014877646] [2021-11-25 18:02:16,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:16,377 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:02:16,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:02:16,378 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:02:16,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-11-25 18:02:16,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:16,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 18:02:16,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:17,179 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:02:17,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:02:18,207 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:02:18,207 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:02:18,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1014877646] [2021-11-25 18:02:18,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1014877646] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:02:18,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [645999971] [2021-11-25 18:02:18,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:18,208 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:02:18,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:02:18,211 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:02:18,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (45)] Waiting until timeout for monitored process [2021-11-25 18:02:18,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:18,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:02:18,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:19,151 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 18:02:19,151 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:02:19,791 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:02:19,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [645999971] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:02:19,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1925677512] [2021-11-25 18:02:19,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:02:19,791 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:19,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:02:19,792 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:02:19,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-25 18:02:20,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:02:20,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:02:20,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:20,201 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 18:02:20,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:02:20,389 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:02:20,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1925677512] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:02:20,390 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:02:20,390 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 8, 8, 8, 8] total 29 [2021-11-25 18:02:20,390 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654201993] [2021-11-25 18:02:20,390 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:02:20,390 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 18:02:20,391 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:02:20,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 18:02:20,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=686, Unknown=0, NotChecked=0, Total=812 [2021-11-25 18:02:20,392 INFO L87 Difference]: Start difference. First operand 160 states and 184 transitions. Second operand has 29 states, 29 states have (on average 3.8275862068965516) internal successors, (111), 28 states have internal predecessors, (111), 9 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (15), 10 states have call predecessors, (15), 9 states have call successors, (15) [2021-11-25 18:02:24,011 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:02:26,030 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:02:28,047 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:02:30,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:02:30,044 INFO L93 Difference]: Finished difference Result 229 states and 267 transitions. [2021-11-25 18:02:30,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-25 18:02:30,045 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.8275862068965516) internal successors, (111), 28 states have internal predecessors, (111), 9 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (15), 10 states have call predecessors, (15), 9 states have call successors, (15) Word has length 67 [2021-11-25 18:02:30,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:02:30,046 INFO L225 Difference]: With dead ends: 229 [2021-11-25 18:02:30,047 INFO L226 Difference]: Without dead ends: 189 [2021-11-25 18:02:30,047 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 369 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=278, Invalid=1204, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 18:02:30,048 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 465 mSDsluCounter, 1092 mSDsCounter, 0 mSdLazyCounter, 352 mSolverCounterSat, 88 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 473 SdHoareTripleChecker+Valid, 1163 SdHoareTripleChecker+Invalid, 487 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 352 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 44 IncrementalHoareTripleChecker+Unchecked, 8.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:02:30,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [473 Valid, 1163 Invalid, 487 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 352 Invalid, 3 Unknown, 44 Unchecked, 8.8s Time] [2021-11-25 18:02:30,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-11-25 18:02:30,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 174. [2021-11-25 18:02:30,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 146 states have (on average 1.13013698630137) internal successors, (165), 148 states have internal predecessors, (165), 18 states have call successors, (18), 10 states have call predecessors, (18), 9 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-25 18:02:30,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 199 transitions. [2021-11-25 18:02:30,072 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 199 transitions. Word has length 67 [2021-11-25 18:02:30,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:02:30,072 INFO L470 AbstractCegarLoop]: Abstraction has 174 states and 199 transitions. [2021-11-25 18:02:30,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 3.8275862068965516) internal successors, (111), 28 states have internal predecessors, (111), 9 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (15), 10 states have call predecessors, (15), 9 states have call successors, (15) [2021-11-25 18:02:30,073 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 199 transitions. [2021-11-25 18:02:30,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-25 18:02:30,074 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:02:30,074 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:02:30,086 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (45)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:30,303 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (44)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:30,507 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-25 18:02:30,683 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:02:30,683 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:02:30,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:02:30,684 INFO L85 PathProgramCache]: Analyzing trace with hash 881349611, now seen corresponding path program 2 times [2021-11-25 18:02:30,684 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:02:30,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1473517253] [2021-11-25 18:02:30,684 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:02:30,685 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:02:30,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:02:30,686 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:02:30,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-25 18:02:30,961 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:02:30,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:02:30,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-25 18:02:30,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:31,467 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 [2021-11-25 18:02:31,675 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:31,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-25 18:02:33,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:33,420 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:33,439 INFO L354 Elim1Store]: treesize reduction 20, result has 31.0 percent of original size [2021-11-25 18:02:33,440 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:02:33,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:33,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:33,672 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:33,692 INFO L354 Elim1Store]: treesize reduction 26, result has 21.2 percent of original size [2021-11-25 18:02:33,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 41 treesize of output 46 [2021-11-25 18:02:35,910 INFO L354 Elim1Store]: treesize reduction 98, result has 6.7 percent of original size [2021-11-25 18:02:35,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 47 treesize of output 29 [2021-11-25 18:02:36,285 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:02:36,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:02:37,699 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:02:37,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1473517253] [2021-11-25 18:02:37,700 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1473517253] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:02:37,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [538220249] [2021-11-25 18:02:37,700 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:02:37,700 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:02:37,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:02:37,702 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:02:37,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (48)] Waiting until timeout for monitored process [2021-11-25 18:02:38,228 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:02:38,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:02:38,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-25 18:02:38,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:02:38,340 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 18 treesize of output 16 [2021-11-25 18:02:39,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:39,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 21 [2021-11-25 18:02:39,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:39,945 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:39,973 INFO L354 Elim1Store]: treesize reduction 14, result has 44.0 percent of original size [2021-11-25 18:02:39,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 30 treesize of output 36 [2021-11-25 18:02:47,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:47,396 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:47,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:47,399 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:47,428 INFO L354 Elim1Store]: treesize reduction 22, result has 33.3 percent of original size [2021-11-25 18:02:47,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 44 treesize of output 53 [2021-11-25 18:02:47,893 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:47,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:02:47,898 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:47,898 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:02:47,902 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 18:02:47,902 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 55 treesize of output 63 [2021-11-25 18:03:14,598 INFO L354 Elim1Store]: treesize reduction 50, result has 31.5 percent of original size [2021-11-25 18:03:14,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 2 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 10 case distinctions, treesize of input 61 treesize of output 55 [2021-11-25 18:03:14,824 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:03:14,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:03:14,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [538220249] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:03:14,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1134845207] [2021-11-25 18:03:14,914 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:03:14,914 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:03:14,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:03:14,915 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:03:14,917 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-25 18:03:15,126 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:03:15,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:03:15,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 71 conjunts are in the unsatisfiable core [2021-11-25 18:03:15,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:03:15,151 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 18 treesize of output 16 [2021-11-25 18:03:16,340 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 [2021-11-25 18:03:17,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:03:17,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-25 18:03:22,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:03:22,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:03:23,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:03:23,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:03:23,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 46 [2021-11-25 18:04:28,524 INFO L354 Elim1Store]: treesize reduction 26, result has 21.2 percent of original size [2021-11-25 18:04:28,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 3 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 4 case distinctions, treesize of input 47 treesize of output 29 [2021-11-25 18:04:28,723 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 14 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:04:28,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:04:28,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1134845207] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:04:28,817 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:04:28,817 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 23, 28] total 68 [2021-11-25 18:04:28,817 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370823880] [2021-11-25 18:04:28,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:04:28,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-25 18:04:28,818 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:04:28,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-25 18:04:28,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=381, Invalid=4729, Unknown=2, NotChecked=0, Total=5112 [2021-11-25 18:04:28,821 INFO L87 Difference]: Start difference. First operand 174 states and 199 transitions. Second operand has 68 states, 64 states have (on average 2.28125) internal successors, (146), 62 states have internal predecessors, (146), 14 states have call successors, (20), 8 states have call predecessors, (20), 11 states have return successors, (18), 15 states have call predecessors, (18), 12 states have call successors, (18) [2021-11-25 18:05:13,298 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:05:15,981 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:05:18,001 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:05:20,016 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:05:22,034 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:05:24,051 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:05:26,065 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:05:28,082 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:05:29,959 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.88s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:05:31,983 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:05:34,000 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:05:36,019 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:05:42,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:05:42,673 INFO L93 Difference]: Finished difference Result 289 states and 322 transitions. [2021-11-25 18:05:42,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-25 18:05:42,673 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 64 states have (on average 2.28125) internal successors, (146), 62 states have internal predecessors, (146), 14 states have call successors, (20), 8 states have call predecessors, (20), 11 states have return successors, (18), 15 states have call predecessors, (18), 12 states have call successors, (18) Word has length 67 [2021-11-25 18:05:42,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:05:42,675 INFO L225 Difference]: With dead ends: 289 [2021-11-25 18:05:42,675 INFO L226 Difference]: Without dead ends: 247 [2021-11-25 18:05:42,678 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 131 SyntacticMatches, 19 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 4383 ImplicationChecksByTransitivity, 140.1s TimeCoverageRelationStatistics Valid=905, Invalid=10859, Unknown=8, NotChecked=0, Total=11772 [2021-11-25 18:05:42,679 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 211 mSDsluCounter, 1743 mSDsCounter, 0 mSdLazyCounter, 1313 mSolverCounterSat, 121 mSolverCounterUnsat, 11 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 35.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 1802 SdHoareTripleChecker+Invalid, 1933 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 1313 IncrementalHoareTripleChecker+Invalid, 11 IncrementalHoareTripleChecker+Unknown, 488 IncrementalHoareTripleChecker+Unchecked, 36.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:05:42,679 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 1802 Invalid, 1933 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 1313 Invalid, 11 Unknown, 488 Unchecked, 36.2s Time] [2021-11-25 18:05:42,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-11-25 18:05:42,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 190. [2021-11-25 18:05:42,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 160 states have (on average 1.13125) internal successors, (181), 162 states have internal predecessors, (181), 18 states have call successors, (18), 12 states have call predecessors, (18), 11 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-25 18:05:42,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 215 transitions. [2021-11-25 18:05:42,706 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 215 transitions. Word has length 67 [2021-11-25 18:05:42,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:05:42,706 INFO L470 AbstractCegarLoop]: Abstraction has 190 states and 215 transitions. [2021-11-25 18:05:42,706 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 64 states have (on average 2.28125) internal successors, (146), 62 states have internal predecessors, (146), 14 states have call successors, (20), 8 states have call predecessors, (20), 11 states have return successors, (18), 15 states have call predecessors, (18), 12 states have call successors, (18) [2021-11-25 18:05:42,706 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 215 transitions. [2021-11-25 18:05:42,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-25 18:05:42,707 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:05:42,707 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:05:42,723 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (48)] Ended with exit code 0 [2021-11-25 18:05:42,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (47)] Forceful destruction successful, exit code 0 [2021-11-25 18:05:43,129 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2021-11-25 18:05:43,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:05:43,308 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:05:43,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:05:43,308 INFO L85 PathProgramCache]: Analyzing trace with hash 1406489528, now seen corresponding path program 1 times [2021-11-25 18:05:43,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:05:43,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [418484735] [2021-11-25 18:05:43,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:05:43,309 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:05:43,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:05:43,310 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:05:43,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-11-25 18:05:43,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:05:43,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 18:05:43,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:05:44,334 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 18:05:44,334 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:05:44,334 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:05:44,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [418484735] [2021-11-25 18:05:44,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [418484735] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:05:44,335 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:05:44,335 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-25 18:05:44,335 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316799670] [2021-11-25 18:05:44,335 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:05:44,335 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 18:05:44,336 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:05:44,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 18:05:44,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:05:44,336 INFO L87 Difference]: Start difference. First operand 190 states and 215 transitions. Second operand has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 9 states have internal predecessors, (49), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 18:05:45,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:05:45,110 INFO L93 Difference]: Finished difference Result 252 states and 288 transitions. [2021-11-25 18:05:45,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 18:05:45,112 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 9 states have internal predecessors, (49), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 69 [2021-11-25 18:05:45,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:05:45,115 INFO L225 Difference]: With dead ends: 252 [2021-11-25 18:05:45,116 INFO L226 Difference]: Without dead ends: 230 [2021-11-25 18:05:45,116 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=76, Invalid=164, Unknown=0, NotChecked=0, Total=240 [2021-11-25 18:05:45,117 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 68 mSDsluCounter, 269 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 348 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:05:45,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 348 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 109 Invalid, 0 Unknown, 21 Unchecked, 0.3s Time] [2021-11-25 18:05:45,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2021-11-25 18:05:45,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 215. [2021-11-25 18:05:45,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 183 states have (on average 1.1256830601092895) internal successors, (206), 185 states have internal predecessors, (206), 20 states have call successors, (20), 12 states have call predecessors, (20), 11 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-25 18:05:45,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 244 transitions. [2021-11-25 18:05:45,155 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 244 transitions. Word has length 69 [2021-11-25 18:05:45,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:05:45,155 INFO L470 AbstractCegarLoop]: Abstraction has 215 states and 244 transitions. [2021-11-25 18:05:45,155 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 9 states have internal predecessors, (49), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 18:05:45,155 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 244 transitions. [2021-11-25 18:05:45,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-25 18:05:45,157 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:05:45,158 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:05:45,177 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (50)] Forceful destruction successful, exit code 0 [2021-11-25 18:05:45,373 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 18:05:45,373 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:05:45,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:05:45,373 INFO L85 PathProgramCache]: Analyzing trace with hash -1656566613, now seen corresponding path program 2 times [2021-11-25 18:05:45,374 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:05:45,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1690772479] [2021-11-25 18:05:45,374 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:05:45,374 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:05:45,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:05:45,375 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:05:45,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2021-11-25 18:05:45,713 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:05:45,713 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:05:45,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 70 conjunts are in the unsatisfiable core [2021-11-25 18:05:45,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:05:46,093 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 [2021-11-25 18:05:46,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:46,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-25 18:05:46,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:46,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:46,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:46,700 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:05:46,700 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 39 [2021-11-25 18:05:48,806 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:05:48,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:48,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:48,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:48,833 INFO L354 Elim1Store]: treesize reduction 20, result has 31.0 percent of original size [2021-11-25 18:05:48,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 43 treesize of output 48 [2021-11-25 18:05:49,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:49,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:49,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:49,146 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:05:49,146 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:05:49,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:49,170 INFO L354 Elim1Store]: treesize reduction 28, result has 24.3 percent of original size [2021-11-25 18:05:49,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 53 treesize of output 61 [2021-11-25 18:05:49,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:49,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:49,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:49,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:49,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:49,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:49,492 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:05:49,492 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:05:49,514 INFO L354 Elim1Store]: treesize reduction 34, result has 17.1 percent of original size [2021-11-25 18:05:49,515 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 11 case distinctions, treesize of input 61 treesize of output 72 [2021-11-25 18:05:52,330 INFO L354 Elim1Store]: treesize reduction 146, result has 4.6 percent of original size [2021-11-25 18:05:52,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 3 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 63 treesize of output 37 [2021-11-25 18:05:52,723 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 16 proven. 17 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:05:52,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:05:54,200 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:05:54,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1690772479] [2021-11-25 18:05:54,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1690772479] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:05:54,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1843452031] [2021-11-25 18:05:54,201 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:05:54,201 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:05:54,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:05:54,202 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:05:54,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (52)] Waiting until timeout for monitored process [2021-11-25 18:05:54,810 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:05:54,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:05:54,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-25 18:05:54,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:05:55,018 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 20 treesize of output 18 [2021-11-25 18:05:56,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:56,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 21 [2021-11-25 18:05:57,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:57,146 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:05:57,188 INFO L354 Elim1Store]: treesize reduction 14, result has 44.0 percent of original size [2021-11-25 18:05:57,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 33 treesize of output 39 [2021-11-25 18:05:58,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:58,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:58,029 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:58,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:05:58,032 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:05:58,035 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 18:05:58,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 48 treesize of output 53 [2021-11-25 18:06:04,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:04,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:04,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:04,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:04,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:04,947 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:06:04,951 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 18:06:04,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 54 treesize of output 62 [2021-11-25 18:06:05,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:05,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:05,572 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:05,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:05,576 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:06:05,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:05,581 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:05,582 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:06:05,617 INFO L354 Elim1Store]: treesize reduction 22, result has 33.3 percent of original size [2021-11-25 18:06:05,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 64 treesize of output 79 [2021-11-25 18:06:06,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:06,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:06,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:06,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:06,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:06,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:06,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:06:06,299 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:06:06,300 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:06:06,304 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-25 18:06:06,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 5 case distinctions, treesize of input 75 treesize of output 89 [2021-11-25 18:06:59,288 INFO L354 Elim1Store]: treesize reduction 66, result has 25.8 percent of original size [2021-11-25 18:06:59,288 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 4 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 14 case distinctions, treesize of input 77 treesize of output 63 [2021-11-25 18:06:59,393 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 4 proven. 27 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:06:59,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:06:59,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1843452031] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:06:59,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1668109121] [2021-11-25 18:06:59,522 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:06:59,522 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:06:59,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:06:59,528 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:06:59,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-25 18:06:59,811 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:06:59,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:06:59,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 80 conjunts are in the unsatisfiable core [2021-11-25 18:06:59,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:06:59,849 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 18 treesize of output 16 [2021-11-25 18:07:01,179 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 [2021-11-25 18:07:01,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:01,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-25 18:07:02,834 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:02,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:02,837 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:02,838 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-25 18:07:10,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:10,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:10,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:10,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 48 [2021-11-25 18:07:11,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:11,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:11,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:11,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:11,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 61 [2021-11-25 18:07:12,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:12,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:12,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:12,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:12,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:12,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:07:12,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 61 treesize of output 72 [2021-11-25 18:08:32,836 INFO L354 Elim1Store]: treesize reduction 42, result has 14.3 percent of original size [2021-11-25 18:08:32,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 5 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 6 case distinctions, treesize of input 63 treesize of output 37 [2021-11-25 18:08:32,867 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 14 proven. 17 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:08:32,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:08:32,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1668109121] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:08:32,972 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:08:32,972 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 26, 31] total 77 [2021-11-25 18:08:32,973 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007661786] [2021-11-25 18:08:32,973 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:08:32,973 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-25 18:08:32,973 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:08:32,974 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-25 18:08:32,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=431, Invalid=6045, Unknown=4, NotChecked=0, Total=6480 [2021-11-25 18:08:32,976 INFO L87 Difference]: Start difference. First operand 215 states and 244 transitions. Second operand has 77 states, 73 states have (on average 2.0821917808219177) internal successors, (152), 71 states have internal predecessors, (152), 14 states have call successors, (20), 8 states have call predecessors, (20), 11 states have return successors, (18), 15 states have call predecessors, (18), 12 states have call successors, (18) [2021-11-25 18:09:33,802 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:09:35,823 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:09:37,841 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:09:38,937 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.10s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:09:40,957 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:09:42,973 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:09:44,906 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.93s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:09:46,934 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:09:48,956 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:09:50,483 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.53s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:09:59,853 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.04s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:10:03,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:10:03,001 INFO L93 Difference]: Finished difference Result 359 states and 402 transitions. [2021-11-25 18:10:03,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-25 18:10:03,004 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 73 states have (on average 2.0821917808219177) internal successors, (152), 71 states have internal predecessors, (152), 14 states have call successors, (20), 8 states have call predecessors, (20), 11 states have return successors, (18), 15 states have call predecessors, (18), 12 states have call successors, (18) Word has length 69 [2021-11-25 18:10:03,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:10:03,006 INFO L225 Difference]: With dead ends: 359 [2021-11-25 18:10:03,006 INFO L226 Difference]: Without dead ends: 277 [2021-11-25 18:10:03,010 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 134 SyntacticMatches, 17 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 5630 ImplicationChecksByTransitivity, 200.1s TimeCoverageRelationStatistics Valid=1080, Invalid=14409, Unknown=11, NotChecked=0, Total=15500 [2021-11-25 18:10:03,011 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 273 mSDsluCounter, 2366 mSDsCounter, 0 mSdLazyCounter, 2009 mSolverCounterSat, 131 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 35.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 278 SdHoareTripleChecker+Valid, 2461 SdHoareTripleChecker+Invalid, 2729 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 2009 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 582 IncrementalHoareTripleChecker+Unchecked, 36.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:10:03,011 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [278 Valid, 2461 Invalid, 2729 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 2009 Invalid, 7 Unknown, 582 Unchecked, 36.3s Time] [2021-11-25 18:10:03,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2021-11-25 18:10:03,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 226. [2021-11-25 18:10:03,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 191 states have (on average 1.1151832460732984) internal successors, (213), 194 states have internal predecessors, (213), 21 states have call successors, (21), 14 states have call predecessors, (21), 13 states have return successors, (19), 17 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-25 18:10:03,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 253 transitions. [2021-11-25 18:10:03,054 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 253 transitions. Word has length 69 [2021-11-25 18:10:03,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:10:03,054 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 253 transitions. [2021-11-25 18:10:03,055 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 73 states have (on average 2.0821917808219177) internal successors, (152), 71 states have internal predecessors, (152), 14 states have call successors, (20), 8 states have call predecessors, (20), 11 states have return successors, (18), 15 states have call predecessors, (18), 12 states have call successors, (18) [2021-11-25 18:10:03,055 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 253 transitions. [2021-11-25 18:10:03,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-25 18:10:03,056 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:10:03,056 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:10:03,082 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-25 18:10:03,279 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (51)] Forceful destruction successful, exit code 0 [2021-11-25 18:10:03,472 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (52)] Forceful destruction successful, exit code 0 [2021-11-25 18:10:03,668 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 18:10:03,668 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:10:03,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:10:03,668 INFO L85 PathProgramCache]: Analyzing trace with hash 2010422392, now seen corresponding path program 1 times [2021-11-25 18:10:03,669 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:10:03,669 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [506083499] [2021-11-25 18:10:03,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:10:03,669 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:10:03,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:10:03,670 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:10:03,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-11-25 18:10:03,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:10:03,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 18:10:03,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:10:04,781 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:10:04,781 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:10:04,782 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:10:04,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [506083499] [2021-11-25 18:10:04,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [506083499] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:10:04,782 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:10:04,783 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-25 18:10:04,783 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167197532] [2021-11-25 18:10:04,783 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:10:04,783 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 18:10:04,784 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:10:04,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 18:10:04,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:10:04,785 INFO L87 Difference]: Start difference. First operand 226 states and 253 transitions. Second operand has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 9 states have internal predecessors, (49), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 18:10:05,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:10:05,711 INFO L93 Difference]: Finished difference Result 271 states and 307 transitions. [2021-11-25 18:10:05,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 18:10:05,712 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 9 states have internal predecessors, (49), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 71 [2021-11-25 18:10:05,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:10:05,714 INFO L225 Difference]: With dead ends: 271 [2021-11-25 18:10:05,714 INFO L226 Difference]: Without dead ends: 249 [2021-11-25 18:10:05,715 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=76, Invalid=164, Unknown=0, NotChecked=0, Total=240 [2021-11-25 18:10:05,715 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 127 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 304 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 23 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:10:05,716 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [127 Valid, 304 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 104 Invalid, 0 Unknown, 23 Unchecked, 0.4s Time] [2021-11-25 18:10:05,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2021-11-25 18:10:05,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 217. [2021-11-25 18:10:05,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 183 states have (on average 1.1202185792349726) internal successors, (205), 185 states have internal predecessors, (205), 20 states have call successors, (20), 14 states have call predecessors, (20), 13 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-25 18:10:05,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 243 transitions. [2021-11-25 18:10:05,764 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 243 transitions. Word has length 71 [2021-11-25 18:10:05,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:10:05,765 INFO L470 AbstractCegarLoop]: Abstraction has 217 states and 243 transitions. [2021-11-25 18:10:05,765 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 9 states have internal predecessors, (49), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 18:10:05,765 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 243 transitions. [2021-11-25 18:10:05,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-25 18:10:05,766 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:10:05,767 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:10:05,783 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (54)] Ended with exit code 0 [2021-11-25 18:10:05,983 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 18:10:05,983 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:10:05,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:10:05,983 INFO L85 PathProgramCache]: Analyzing trace with hash 1742899633, now seen corresponding path program 2 times [2021-11-25 18:10:05,984 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:10:05,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [767482184] [2021-11-25 18:10:05,984 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:10:05,984 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:10:05,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:10:05,985 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:10:05,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (55)] Waiting until timeout for monitored process [2021-11-25 18:10:06,269 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:10:06,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:10:06,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 18:10:06,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:10:07,111 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 18:10:07,112 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:10:08,436 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:10:08,436 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:10:08,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [767482184] [2021-11-25 18:10:08,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [767482184] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:10:08,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1743920326] [2021-11-25 18:10:08,437 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:10:08,437 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:10:08,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:10:08,443 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:10:08,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (56)] Waiting until timeout for monitored process [2021-11-25 18:10:09,003 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:10:09,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:10:09,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 18:10:09,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:10:09,992 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 16 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 18:10:09,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:10:11,719 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:10:11,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1743920326] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:10:11,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1345819239] [2021-11-25 18:10:11,720 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:10:11,720 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:10:11,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:10:11,721 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:10:11,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-25 18:10:11,971 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:10:11,971 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:10:11,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 18:10:11,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:10:12,642 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 16 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 18:10:12,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:10:16,263 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:10:16,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1345819239] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:10:16,264 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:10:16,264 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 12, 12, 12, 14] total 49 [2021-11-25 18:10:16,264 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852214859] [2021-11-25 18:10:16,264 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:10:16,265 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-25 18:10:16,265 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:10:16,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-25 18:10:16,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=409, Invalid=1943, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 18:10:16,266 INFO L87 Difference]: Start difference. First operand 217 states and 243 transitions. Second operand has 49 states, 49 states have (on average 2.63265306122449) internal successors, (129), 48 states have internal predecessors, (129), 11 states have call successors, (17), 2 states have call predecessors, (17), 3 states have return successors, (17), 12 states have call predecessors, (17), 11 states have call successors, (17) [2021-11-25 18:10:23,922 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:10:29,567 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.00s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:10:36,344 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:10:38,794 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:10:44,274 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.06s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:10:46,298 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.07s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:10:47,356 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.06s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:10:50,462 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.20s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:10:54,097 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.94s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:10:56,161 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.00s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:10:58,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:10:58,075 INFO L93 Difference]: Finished difference Result 510 states and 627 transitions. [2021-11-25 18:10:58,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-25 18:10:58,076 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.63265306122449) internal successors, (129), 48 states have internal predecessors, (129), 11 states have call successors, (17), 2 states have call predecessors, (17), 3 states have return successors, (17), 12 states have call predecessors, (17), 11 states have call successors, (17) Word has length 71 [2021-11-25 18:10:58,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:10:58,079 INFO L225 Difference]: With dead ends: 510 [2021-11-25 18:10:58,080 INFO L226 Difference]: Without dead ends: 455 [2021-11-25 18:10:58,081 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 372 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1481 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=1167, Invalid=4383, Unknown=0, NotChecked=0, Total=5550 [2021-11-25 18:10:58,082 INFO L933 BasicCegarLoop]: 177 mSDtfsCounter, 795 mSDsluCounter, 3358 mSDsCounter, 0 mSdLazyCounter, 1525 mSolverCounterSat, 310 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 36.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 799 SdHoareTripleChecker+Valid, 3535 SdHoareTripleChecker+Invalid, 1965 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 310 IncrementalHoareTripleChecker+Valid, 1525 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 127 IncrementalHoareTripleChecker+Unchecked, 36.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:10:58,082 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [799 Valid, 3535 Invalid, 1965 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [310 Valid, 1525 Invalid, 3 Unknown, 127 Unchecked, 36.8s Time] [2021-11-25 18:10:58,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2021-11-25 18:10:58,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 234. [2021-11-25 18:10:58,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 234 states, 199 states have (on average 1.1407035175879396) internal successors, (227), 201 states have internal predecessors, (227), 21 states have call successors, (21), 14 states have call predecessors, (21), 13 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-25 18:10:58,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 267 transitions. [2021-11-25 18:10:58,139 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 267 transitions. Word has length 71 [2021-11-25 18:10:58,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:10:58,139 INFO L470 AbstractCegarLoop]: Abstraction has 234 states and 267 transitions. [2021-11-25 18:10:58,140 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.63265306122449) internal successors, (129), 48 states have internal predecessors, (129), 11 states have call successors, (17), 2 states have call predecessors, (17), 3 states have return successors, (17), 12 states have call predecessors, (17), 11 states have call successors, (17) [2021-11-25 18:10:58,140 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 267 transitions. [2021-11-25 18:10:58,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-25 18:10:58,141 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:10:58,141 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:10:58,162 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (55)] Forceful destruction successful, exit code 0 [2021-11-25 18:10:58,360 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (56)] Forceful destruction successful, exit code 0 [2021-11-25 18:10:58,582 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2021-11-25 18:10:58,755 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:10:58,755 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:10:58,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:10:58,756 INFO L85 PathProgramCache]: Analyzing trace with hash -658266963, now seen corresponding path program 2 times [2021-11-25 18:10:58,756 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:10:58,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2041856255] [2021-11-25 18:10:58,757 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:10:58,757 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:10:58,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:10:58,758 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:10:58,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (58)] Waiting until timeout for monitored process [2021-11-25 18:10:59,043 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:10:59,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:10:59,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 18:10:59,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:11:00,147 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 18:11:00,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:11:01,797 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:11:01,797 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:11:01,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2041856255] [2021-11-25 18:11:01,797 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2041856255] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:11:01,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [41740010] [2021-11-25 18:11:01,798 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:11:01,798 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:11:01,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:11:01,799 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:11:01,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (59)] Waiting until timeout for monitored process [2021-11-25 18:11:02,350 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:11:02,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:11:02,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 18:11:02,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:11:03,976 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 16 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 18:11:03,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:11:05,907 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:11:05,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [41740010] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:11:05,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1687844072] [2021-11-25 18:11:05,908 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:11:05,908 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:11:05,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:11:05,909 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:11:05,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b339075-6d33-4432-909b-d1e03be6e28d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-25 18:11:06,163 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:11:06,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:11:06,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 18:11:06,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:11:07,345 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 16 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 18:11:07,345 INFO L328 TraceCheckSpWp]: Computing backward predicates...