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  1. Core Server
  2. SERVER-36531

Lock acquisition may throw despite presence of UninterruptibleLockGuard when WT tickets are exhausted

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 4.0.3, 4.1.3
    • Component/s: Concurrency, Storage
    • Labels:
    • Backwards Compatibility:
      Fully Compatible
    • Operating System:
      ALL
    • Backport Requested:
      v4.0
    • Sprint:
      Storage NYC 2018-09-10
    • Linked BF Score:
      58

      Description

      When we create a DBLock, a global lock is created with "throw" interrupt behavior. The result is that we may propagate an exception from here when this call to checkForInterrupt throws.

      Since there are some places where we acquire locks in dispose() methods (which we don't allow to throw), such as here, this is a problem.

      Here's a full stack trace (I was able to produce this by creating a "NoInterruptsAllowedGuard", which disallows calls to checkForInterrupt() when active.

       /data/mci/a31b453f7981568261a490b2163f8846/src/src/mongo/db/operation_context.cpp:197:0: mongo::OperationContext::checkForInterruptNoAssert()
       /data/mci/a31b453f7981568261a490b2163f8846/src/src/mongo/db/operation_context.cpp:169:0: mongo::OperationContext::checkForInterrupt()
       /data/mci/a31b453f7981568261a490b2163f8846/src/src/mongo/util/concurrency/ticketholder.cpp:119:0: mongo::TicketHolder::waitForTicketUntil(mongo::OperationContext*, mongo::Date_t)
       /data/mci/a31b453f7981568261a490b2163f8846/src/src/mongo/util/concurrency/ticketholder.cpp:90:0: mongo::TicketHolder::waitForTicket(mongo::OperationContext*)
       /data/mci/a31b453f7981568261a490b2163f8846/src/src/mongo/db/concurrency/lock_state.cpp:307:0: mongo::LockerImpl::_acquireTicket(mongo::OperationContext*, mongo::LockMode, mongo::Date_t)
       /data/mci/a31b453f7981568261a490b2163f8846/src/src/mongo/db/concurrency/lock_state.cpp:320:0: mongo::LockerImpl::_lockGlobalBegin(mongo::OperationContext*, mongo::LockMode, mongo::Date_t)
       /data/mci/a31b453f7981568261a490b2163f8846/src/src/mongo/db/concurrency/d_concurrency.cpp:176:0: mongo::Lock::GlobalLock::_enqueue(mongo::LockMode, mongo::Date_t)
       /data/mci/a31b453f7981568261a490b2163f8846/src/src/mongo/db/concurrency/d_concurrency.cpp:157:0: mongo::Lock::GlobalLock::GlobalLock(mongo::OperationContext*, mongo::LockMode, mongo::Date_t, mongo::Lock::InterruptBehavior, mongo::Lock::GlobalLock::EnqueueOnly)
       /data/mci/a31b453f7981568261a490b2163f8846/src/src/mongo/db/concurrency/d_concurrency.cpp:143:0: mongo::Lock::GlobalLock::GlobalLock(mongo::OperationContext*, mongo::LockMode, mongo::Date_t, mongo::Lock::InterruptBehavior)
       /data/mci/a31b453f7981568261a490b2163f8846/src/src/mongo/db/concurrency/d_concurrency.cpp:216:0: mongo::Lock::DBLock::DBLock(mongo::OperationContext*, mongo::StringData, mongo::LockMode, mongo::Date_t)
       /data/mci/a31b453f7981568261a490b2163f8846/src/src/mongo/db/catalog_raii.cpp:63:0: mongo::AutoGetDb::AutoGetDb(mongo::OperationContext*, mongo::StringData, mongo::LockMode, mongo::Date_t)
       /data/mci/a31b453f7981568261a490b2163f8846/src/src/mongo/db/pipeline/document_source_cursor.cpp:268:0: mongo::DocumentSourceCursor::cleanupExecutor()
       /data/mci/a31b453f7981568261a490b2163f8846/src/src/mongo/db/pipeline/document_source_cursor.cpp:254:0: mongo::DocumentSourceCursor::doDispose()
       /data/mci/a31b453f7981568261a490b2163f8846/src/src/mongo/db/pipeline/document_source.h:458:0: mongo::DocumentSource::dispose()
       /data/mci/a31b453f7981568261a490b2163f8846/src/src/mongo/db/pipeline/pipeline.cpp:328:0: mongo::Pipeline::dispose(mongo::OperationContext*)
       /data/mci/a31b453f7981568261a490b2163f8846/src/src/mongo/db/exec/plan_stage.h:279:0: mongo::PlanStage::dispose(mongo::OperationContext*)
       /data/mci/a31b453f7981568261a490b2163f8846/src/src/mongo/db/query/plan_executor.cpp:683:0: mongo::PlanExecutor::dispose(mongo::OperationContext*, mongo::CursorManager*)
       /data/mci/a31b453f7981568261a490b2163f8846/src/src/mongo/db/clientcursor.cpp:128:0: mongo::ClientCursor::dispose(mongo::OperationContext*)
       /data/mci/a31b453f7981568261a490b2163f8846/src/src/mongo/db/clientcursor.cpp:237:0: mongo::ClientCursorPin::deleteUnderlying()
      

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